{"id":16,"date":"2026-10-13T09:45:43","date_gmt":"2026-10-13T01:45:43","guid":{"rendered":"https:\/\/en.usaebo.com\/?page_id=16"},"modified":"2026-10-20T17:54:30","modified_gmt":"2026-10-20T09:54:30","slug":"past-papers","status":"publish","type":"page","link":"https:\/\/en.usaebo.com\/papers\/","title":{"rendered":"USAEBO Past Papers &#038; Preparation"},"content":{"rendered":"<div class=\"wrap\"><main class=\"resource-main\" id=\"main\"><div class=\"resource-library-page resource-journey\">\n<nav aria-label=\"Breadcrumb\" class=\"breadcrumb\"><a href=\"https:\/\/en.usaebo.com\/\">Home<\/a><span aria-hidden=\"true\">\/<\/span><span aria-current=\"page\">Resources<\/span><\/nav>\n<header class=\"page-head rr-page-head\"><h1>USAEBO papers and resources<\/h1><p>Start with the official samples, then plan practice by topic. Explore paper previews, historical handbooks and IEO extension resources in one place.<\/p><div class=\"rr-library-meta\">Two sample sets to read and download directly \u00b7 One-page past-paper previews<\/div><\/header><nav aria-label=\"Jump to section\" class=\"page-anchors\"><a href=\"#documents\">Free samples<\/a><a href=\"#topics\">Practice guide<\/a><a href=\"#paper-bundle\">Past-paper bundle<\/a><a href=\"#handbooks\">Past handbooks<\/a><a href=\"#ieo\">IEO extension<\/a><a href=\"#resource-faq\">Resource questions<\/a><\/nav>\n\n\n<section class=\"rr-section\" id=\"documents\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>Try the official samples<\/h2><\/div><p>Read online or download directly; no adviser contact needed.<\/p><\/header>\n<div class=\"rr-round\"><header class=\"rr-round-head\"><div class=\"rj-round-label\">Round 1<span>Multiple choice<\/span><\/div><p>2027 format: 40 questions \u00b7 60 minutes<\/p><\/header><ul class=\"rr-document-list\"><li class=\"rr-document\" id=\"samples-r1\"><a aria-label=\"Read online: Official Round 1 samples\" class=\"rr-cover\" href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r1&amp;pdfpage=1\"><img decoding=\"async\" alt=\"Official Round 1 samples \u00b7 original first page\" height=\"414\" loading=\"lazy\" src=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/documents\/samples-r1-preview.webp\" width=\"320\"\/><\/a><div class=\"rr-document-copy\"><p class=\"rr-document-meta\"><span>START WITH SAMPLES<\/span><span>PDF \u00b7 2 pages<\/span><\/p><h3 class=\"rj-sample-title\"><a href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r1&amp;pdfpage=1\">Official Round 1 samples<\/a><\/h3><p>4 multiple-choice samples to introduce English question wording and calculations.<\/p><p class=\"rr-document-scope\">Practice focus: perfect competition, complements, interest-rate equations and NPV.<\/p><\/div><div class=\"rr-actions\"><a class=\"rr-read\" href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r1&amp;pdfpage=1\">Read online<\/a><a aria-label=\"Download PDF: Official Round 1 samples\" class=\"rr-download\" download=\"\" href=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/documents\/USAEBO%20sample%20problems%2C%20Round%201.pdf\">Download PDF<\/a><\/div><\/li><\/ul><\/div>\n<div class=\"rr-round\"><header class=\"rr-round-head\"><div class=\"rj-round-label\">Round 2<span>Open response<\/span><\/div><p>2027 format: 120 minutes \u00b7 question count not specified<\/p><\/header><ul class=\"rr-document-list\"><li class=\"rr-document\" id=\"samples-r2\"><a aria-label=\"Read online: Official Round 2 samples\" class=\"rr-cover\" href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r2&amp;pdfpage=1\"><img decoding=\"async\" alt=\"Official Round 2 samples \u00b7 original first page\" height=\"414\" loading=\"lazy\" src=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/documents\/samples-r2-preview.webp\" width=\"320\"\/><\/a><div class=\"rr-document-copy\"><p class=\"rr-document-meta\"><span>START WITH SAMPLES<\/span><span>PDF \u00b7 1 page<\/span><\/p><h3 class=\"rj-sample-title\"><a href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r2&amp;pdfpage=1\">Official Round 2 samples<\/a><\/h3><p>2 open-response samples for practicing step-by-step calculations and explanations.<\/p><p class=\"rr-document-scope\">Practice focus: market equilibrium, price ceilings, nominal and real GDP.<\/p><\/div><div class=\"rr-actions\"><a class=\"rr-read\" href=\"https:\/\/en.usaebo.com\/docs\/?doc=samples-r2&amp;pdfpage=1\">Read online<\/a><a aria-label=\"Download PDF: Official Round 2 samples\" class=\"rr-download\" download=\"\" href=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/documents\/USAEBO%20sample%20problems%2C%20Round%202.pdf\">Download PDF<\/a><\/div><\/li><\/ul><\/div>\n<\/section>\n<section class=\"rr-section rr-section--topics\" id=\"topics\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>What to practice after the samples<\/h2><\/div><p>Use unfamiliar concepts to choose your next practice questions.<\/p><\/header><ol class=\"rj-steps\"><li><strong>Attempt the samples<\/strong><p>Note unfamiliar concepts, calculations and English wording before reviewing your work.<\/p><\/li><li><strong>Review by topic<\/strong><p>Use the index and syllabus to focus on concepts you cannot yet explain clearly.<\/p><\/li><li><strong>Check with past papers<\/strong><p>Practice decisions and calculations in Round 1; show assumptions, reasoning and conclusions in Round 2.<\/p><\/li><\/ol><details class=\"rj-index\"><summary>View the 2026 past-paper topic index<\/summary><div><div class=\"rr-topic-group\"><h3>Round 1 \u00b7 25 multiple-choice questions<\/h3><ul class=\"rr-topic-list\"><li><span class=\"rr-question\">Q1\u20133<\/span><span>Opportunity cost, comparative advantage, demand elasticity<\/span><span class=\"rr-page-reference\">pp. 1<\/span><\/li><li><span class=\"rr-question\">Q4\u201312<\/span><span>Revenue maximization, taxes, costs, monopoly, Nash equilibrium, externalities<\/span><span class=\"rr-page-reference\">pp. 2\u20135<\/span><\/li><li><span class=\"rr-question\">Q13\u201321<\/span><span>GDP, inflation, employment, multipliers, AD-AS, output gaps, Phillips curve, loanable funds<\/span><span class=\"rr-page-reference\">pp. 5\u20138<\/span><\/li><li><span class=\"rr-question\">Q22\u201325<\/span><span>Profit maximization, revenue\/cost graphs, NPV, elasticity<\/span><span class=\"rr-page-reference\">pp. 9\u201310<\/span><\/li><\/ul><\/div><div class=\"rr-topic-group\"><h3>Round 2 \u00b7 7 problems, 20 points each<\/h3><ul class=\"rr-topic-list\"><li><span class=\"rr-question\">P1<\/span><span>Consumer choice: budget constraints, demand and income effects<\/span><span class=\"rr-page-reference\">pp. 1\u20132<\/span><\/li><li><span class=\"rr-question\">P2<\/span><span>Duopoly: best responses, Nash equilibrium and collusion<\/span><span class=\"rr-page-reference\">pp. 3<\/span><\/li><li><span class=\"rr-question\">P3<\/span><span>Fiscal stimulus: spending multipliers, interest rates and crowding out<\/span><span class=\"rr-page-reference\">pp. 4<\/span><\/li><li><span class=\"rr-question\">P4<\/span><span>Pollution and externalities: social efficiency, taxes and quotas<\/span><span class=\"rr-page-reference\">pp. 5<\/span><\/li><li><span class=\"rr-question\">P5<\/span><span>Intertemporal choice: saving, interest rates and time preferences<\/span><span class=\"rr-page-reference\">pp. 6<\/span><\/li><li><span class=\"rr-question\">P6<\/span><span>Labor-market signaling: separating, pooling and incentive compatibility<\/span><span class=\"rr-page-reference\">pp. 7\u20138<\/span><\/li><li><span class=\"rr-question\">P7<\/span><span>Corporate finance: risk sharing, expected utility and moral hazard<\/span><span class=\"rr-page-reference\">pp. 9\u201310<\/span><\/li><\/ul><\/div><p class=\"rr-footnote\">Use this index to address gaps, rather than to predict future questions. Attempt the problems independently before returning to the syllabus. <a href=\"https:\/\/en.usaebo.com\/syllabus\/\">View the full syllabus<\/a><\/p><\/div><\/details><\/section><section class=\"rr-section rj-bundle\" id=\"paper-bundle\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>2026 papers: preview before requesting<\/h2><\/div><p>Two original papers, 20 pages; request the complete bundle if useful.<\/p><\/header><p>The two papers work with the topic index on this page to help organize concept, calculation and open-response practice.<\/p><details class=\"rj-catalogue\" open=\"\"><summary>View the paper list and previews<\/summary><div><article class=\"rj-paper\" id=\"paper-r1\"><h3>2026 Round 1 paper<\/h3><p class=\"rr-file-meta\">PDF \u00b7 10 pages<\/p><p>25 multiple-choice questions for concept, calculation and graph practice.<\/p><p class=\"rr-document-scope\">Use it to check concepts, calculations and graphs; its length differs from the 2027 format.<\/p><details class=\"rj-preview\"><summary>Preview page 1 of 10<\/summary><figure><img decoding=\"async\" alt=\"Page 1 preview of the 2026 USAEBO Round 1 paper\" height=\"1553\" loading=\"lazy\" src=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/resource-previews\/2026-round-1-page-1.webp\" width=\"1200\"\/><figcaption>Original paper, page 1 \u00b7 English<a href=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/resource-previews\/2026-round-1-page-1.webp\" rel=\"noopener\" target=\"_blank\">Open full-size preview<\/a><\/figcaption><\/figure><\/details><\/article><article class=\"rj-paper\" id=\"paper-r2\"><h3>2026 Round 2 paper<\/h3><p class=\"rr-file-meta\">PDF \u00b7 10 pages<\/p><p>7 open-response problems, 20 points each and 140 points in total; reasoning is required.<\/p><p class=\"rr-document-scope\">Use it to practice model assumptions, step-by-step derivations and explanations in English.<\/p><details class=\"rj-preview\"><summary>Preview page 1 of 10<\/summary><figure><img decoding=\"async\" alt=\"Page 1 preview of the 2026 USAEBO Round 2 paper\" height=\"1553\" loading=\"lazy\" src=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/resource-previews\/2026-round-2-page-1.webp\" width=\"1200\"\/><figcaption>Original paper, page 1 \u00b7 English<a href=\"\/wp-content\/themes\/usaebo-hanlin\/assets\/resource-previews\/2026-round-2-page-1.webp\" rel=\"noopener\" target=\"_blank\">Open full-size preview<\/a><\/figcaption><\/figure><\/details><\/article><\/div><\/details><aside aria-label=\"Notes on using the resources\" class=\"rr-important\"><ul><li>USAEBO files here do not include official answers.<\/li><li>Use 2026 papers for study; they are not full 2027 mock exams.<\/li><\/ul><\/aside><div class=\"rj-claim\"><p>Contact the adviser on WeChat and send \u201cUSAEBO papers\u201d to request the files.<\/p><a class=\"rj-request\" data-consult-note=\"Contact the adviser on WeChat and send \u201cUSAEBO papers\u201d to request the files.\" data-consult-title=\"2026 USAEBO paper bundle\" data-consult-topic=\"resources\" data-consult-trigger=\"\" data-resource-bundle=\"papers\" href=\"#consult\">Request the paper bundle on WeChat<\/a><\/div><\/section>\n\n<section class=\"rr-section rr-section--history rj-secondary\" id=\"handbooks\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>Historical handbooks and procedures<\/h2><\/div><p>For students exploring how the previous exams were organized.<\/p><\/header><p class=\"rr-year-note\"><strong>Historical reference for 2026 only.<\/strong> Equipment, OBS, LateranAI, permitted materials and submission rules do not establish the 2027 requirements. Follow the handbook and participant notices for the relevant season.<\/p><details class=\"rj-catalogue\"><summary>View the handbook list (3 PDFs) and historical records<\/summary><div><ul class=\"rr-attachment-list\"><li class=\"rr-attachment\" id=\"handbook-r1\"><div><p class=\"rr-file-meta\">PDF \u00b7 4 pages<\/p><h3>2026 Round 1 handbook<\/h3><p>May 13, 2026 version: equipment, proctoring, the answer form and supplementary form.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"handbook-r2\"><div><p class=\"rr-file-meta\">PDF \u00b7 4 pages<\/p><h3>2026 Round 2 handbook<\/h3><p>May 25, 2026 version: handwriting, partial credit, scanning and a separate file for each problem.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"proctoring-instructions\"><div><p class=\"rr-file-meta\">PDF \u00b7 2 pages<\/p><h3>LateranAI technical instructions<\/h3><p>Referenced by the 2026 handbooks: installation, supported systems and updates.<\/p><\/div><\/li><\/ul><section class=\"rj-historical-records\" id=\"results\"><h3>Additional historical records<\/h3><ul class=\"rr-attachment-list\"><li class=\"rr-attachment\"><div><p class=\"rr-file-meta\">CSV \u00b7 USAEBO \/ 2026<\/p><h3>Published Round 2 award list<\/h3><p>Names, schools and award categories; no individual scores or qualifying cutoffs.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"press-release\"><div><p class=\"rr-file-meta\">PDF \u00b7 2 pages<\/p><h3>2026 Team USA international results<\/h3><p>The Team USA international results announcement published July 20, 2026.<\/p><\/div><\/li><\/ul><\/section><\/div><\/details><details class=\"rr-archive-details\"><summary><span>Read the 2026 procedure reference<\/span><span class=\"rr-summary-meta\">Historical rules \u00b7 6 topics<\/span><\/summary><div class=\"rr-archive-body\"><p class=\"rr-year-note\">Everything below comes from the 2026 materials and does not establish the equipment or submission arrangements for 2027.<\/p><dl><div><dt>Equipment and preparation<\/dt><dd>The 2026 handbooks required one computer and setup 30 minutes before the exam. Blank paper, pens or pencils and non-programmable calculators were permitted; additional monitors were prohibited. Listed accessory exceptions included a mouse, keyboard, power supply, adapters and external drives.<\/dd><\/div><div><dt>OBS recordings and technical proctoring<\/dt><dd>The 2026 handbooks required OBS to record the entire screen, including the taskbar, together with two camera views showing the contestant\u2019s face and surroundings. Recording began 10 minutes before the exam, and contestants were required to remain at their desks. LateranAI was a separate requirement and did not replace the required camera recordings.<\/dd><\/div><div><dt>Round 1 submission<\/dt><dd>In 2026, the answer form had to be submitted before the exam deadline; the handbook recommended reserving at least five minutes. The supplementary form, including recording links and scanned scratch paper, was due within 24 hours after the exam.<\/dd><\/div><div><dt>Round 2 handwriting and partial credit<\/dt><dd>The 2026 rules required handwritten responses on blank paper, with the contestant\u2019s name, school, problem number and page number on each sheet. Subparts had to be labeled, final answers boxed and handwriting legible for scanning. Well-reasoned work could receive partial credit even when the final answer was incorrect.<\/dd><\/div><div><dt>Round 2 scanning and uploading<\/dt><dd>In 2026, the 30 minutes after the exam were for scanning and submission only, with no further solving permitted. Each problem required a separate file, combining all pages for that problem. Recording continued through scanning, uploading and submission; the supplementary form was due within 24 hours.<\/dd><\/div><div><dt>Scratch-paper retention and LateranAI<\/dt><dd>The 2026 handbooks required scratch paper to be retained for 14 days. The accompanying LateranAI file lists Windows 11 and macOS 15; credentials and the software download were supplied through a personal email. These are historical instructions, and 2027 requirements need separate confirmation.<\/dd><\/div><\/dl><\/div><\/details><div class=\"rj-claim\"><p>Contact the adviser on WeChat and send \u201cUSAEBO handbooks\u201d to request the files.<\/p><a class=\"rj-request\" data-consult-note=\"Contact the adviser on WeChat and send \u201cUSAEBO handbooks\u201d to request the files.\" data-consult-title=\"2026 handbook bundle\" data-consult-topic=\"resources\" data-consult-trigger=\"\" data-resource-bundle=\"history\" href=\"#consult\">Request the handbook bundle on WeChat<\/a><\/div><\/section>\n<section class=\"rr-section rr-extension-section rj-secondary\" id=\"ieo\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>IEO extension: explore further when ready<\/h2><\/div><p>6 PDFs: tasks, corresponding answers, syllabus and business case.<\/p><\/header><div class=\"rr-ieo-scope\"><h3>Keep the two competitions distinct<\/h3><p>USAEBO is a two-round individual competition that selects eligible students to represent the United States at IEO. IEO has its own syllabus, scoring rules and team business case. The answers below apply only to IEO papers and do not establish USAEBO answers or its exam format.<\/p><\/div><details class=\"rj-catalogue\"><summary>View the IEO resource list (6 PDFs \u00b7 83 pages)<\/summary><div class=\"rr-ieo-body\"><section class=\"rr-ieo-pair\"><header class=\"usaebo-section-inner\"><h3>Multiple choice: attempt, then check<\/h3><p>The answer version marks correct choices in red; it does not provide worked derivations.<\/p><\/header><ul class=\"rr-attachment-list\"><li class=\"rr-attachment\" id=\"IEO_2026_MCQ_Tasks\"><div><p class=\"rr-file-meta\">PDF \u00b7 14 pages<\/p><h3>2026 IEO multiple-choice tasks<\/h3><p>The international competition\u2019s multiple-choice paper for further practice.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"IEO_2026_MCQ_Tasks_with_Solutions\"><div><p class=\"rr-file-meta\">PDF \u00b7 14 pages<\/p><h3>2026 IEO multiple-choice answers<\/h3><p>Correct choices are marked in red; this is not a set of worked derivations.<\/p><\/div><\/li><\/ul><\/section><section class=\"rr-ieo-pair\"><header class=\"usaebo-section-inner\"><h3>Open questions: review reasoning and marking<\/h3><p>Attempt the original questions before reviewing the solutions and marking schemes.<\/p><\/header><ul class=\"rr-attachment-list\"><li class=\"rr-attachment\" id=\"IEO_2026_Economics_Finance_OQ_Tasks\"><div><p class=\"rr-file-meta\">PDF \u00b7 5 pages<\/p><h3>2026 IEO open questions<\/h3><p>International open questions for model-based analysis, derivations and explanation.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"IEO_2026_Economics_Finance_OQ_Solutions\"><div><p class=\"rr-file-meta\">PDF \u00b7 32 pages<\/p><h3>2026 IEO open-question solutions<\/h3><p>Includes solutions and marking schemes for review after attempting the questions.<\/p><\/div><\/li><\/ul><\/section><section class=\"rr-ieo-pair\"><header class=\"usaebo-section-inner\"><h3>Syllabus and team business case<\/h3><\/header><ul class=\"rr-attachment-list\"><li class=\"rr-attachment\" id=\"IEO_Syllabus\"><div><p class=\"rr-file-meta\">PDF \u00b7 9 pages<\/p><h3>IEO syllabus<\/h3><p>Version approved December 31, 2025; an introduction to the international competition\u2019s scope.<\/p><\/div><\/li><li class=\"rr-attachment\" id=\"IEO_2026_Business_Case\"><div><p class=\"rr-file-meta\">PDF \u00b7 9 pages<\/p><h3>2026 IEO business case<\/h3><p>A regional economic development zone case, including the task, presentation requirements and evaluation criteria.<\/p><\/div><\/li><\/ul><\/section><div class=\"rr-further-reading\"><h3>The scope of the further reading<\/h3><p>IEO recommends the microeconomics and macroeconomics parts of CORE Econ\u2019s The Economy 2.0, with Mankiw\u2019s Principles of Economics as a supplement. Finance resources include GFLEC, FDIC Money Smart, PwC personal finance lessons and Khan Academy. These are IEO recommendations, not an official USAEBO textbook list.<\/p><\/div><\/div><\/details><div class=\"rj-claim\"><p>Contact the adviser on WeChat and send \u201cIEO resources\u201d to request the files.<\/p><a class=\"rj-request\" data-consult-note=\"Contact the adviser on WeChat and send \u201cIEO resources\u201d to request the files.\" data-consult-title=\"IEO extension bundle\" data-consult-topic=\"resources\" data-consult-trigger=\"\" data-resource-bundle=\"ieo\" href=\"#consult\">Request the IEO bundle on WeChat<\/a><\/div><\/section>\n\n<section class=\"rr-section rr-faq-section\" id=\"resource-faq\"><header class=\"rr-section-head usaebo-section-inner\"><div><h2>Questions about these resources<\/h2><\/div><\/header><div class=\"rr-faq-list\"><details><summary>What can I use directly, and how do I request full files?<\/summary><div><p>Both official sample sets can be read and downloaded directly. The practice guide, topic index and first-page previews of both 2026 papers are also available here. For complete files, choose a bundle, contact the adviser on WeChat and send its name; the adviser provides the files. Requesting resources does not register you for the competition.<\/p><\/div><\/details><details><summary>Should I start with samples or past papers?<\/summary><div><p>Start with the samples to learn the question styles: four multiple-choice questions for Round 1 and two open-response problems for Round 2. Then attempt the 2026 papers: 25 multiple-choice questions in Round 1 and seven open-response problems worth 20 points each in Round 2. Samples provide an introduction; past papers support a broader check of your knowledge.<\/p><\/div><\/details><details><summary>Do the USAEBO files include official answers?<\/summary><div><p>The two USAEBO past papers and two sample sets on this page do not include answer keys or worked solutions. A separate publicly available official USAEBO answer file has not been located. Answers in the IEO section apply only to the IEO papers and cannot be used to check USAEBO responses.<\/p><\/div><\/details><details><summary>Can I use the 2026 papers as full 2027 mocks?<\/summary><div><p>Use them to practice economic concepts, graphs, calculations and reasoning in English. They are not full mocks for the 2027 format. Round 1 in 2027 has 40 questions in 60 minutes; Round 2 is open response with 120 minutes, and the announcement reviewed does not specify its question count. Both rounds use technical proctoring. Read the schedule page on this site for the season\u2019s requirements.<\/p><\/div><\/details><details><summary>Do the historical equipment and submission rules still apply?<\/summary><div><p>The 2026 handbooks and LateranAI instructions explain the procedures used that year. Requirements for OBS recordings, supported systems, permitted materials and submission windows do not automatically carry over to 2027. Prepare using the handbook and participant notices for the relevant season.<\/p><\/div><\/details><details><summary>How should I choose what to study next?<\/summary><div><p>Attempt the samples independently and note unfamiliar concepts. Use the index to find related past questions, then return to the syllabus to address gaps. For Round 2, also practice explanations in English, model assumptions and step-by-step derivations.<\/p><\/div><\/details><\/div><\/section><\/div><\/main><\/div>","protected":false},"excerpt":{"rendered":"<p>Download USAEBO past papers, samples and historical handbooks. Explore question topics, historical awards and separate IEO extension materials on this site.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_hl_baseline_seo_title":"USAEBO papers and resources - USAEBO","_hl_baseline_seo_description":"Download official USAEBO samples, preview the 2026 papers and use the topic index. 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