Best free resources for CLEP US History I (and what to skip) | Flying Prep
Best free resources for CLEP US History I (and what to skip)
Khan Academy, OpenStax, the Library of Congress, and Modern States vouchers are all free, all useful, and not equivalent. Here is which one to use when, and the two free resources I would skip.
By Alex Stone·7 min read·Last fact-checked May 2026
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The four free resources worth using for CLEP US History I are Khan Academy (for explanation videos), OpenStax (for the textbook), the Library of Congress (for primary sources), and Modern States (for the exam-fee voucher only). Each one fills a different role in a focused study plan. The two free resources most students stumble into and waste time on, by contrast, are unstructured YouTube playlists and unverified flashcard decks. This guide explains when to use each free resource, what they actually deliver, and where the gaps are that paid practice (Flying Prep) is built to fill.
CLEP US History I costs $97 to sit. That is cheap for college credit (worth $1,500 or more at most universities) but not free. The exam fee voucher from Modern States is the single most valuable free resource for this exam, and it is the first one to chase. Everything else (videos, textbooks, primary sources, practice questions) is the input that gets you ready to use the voucher.
Practice questions are where free falls short. The exam tests pattern recognition across 120 questions in 90 minutes, and pattern recognition only develops by practicing in the exam's format. Free question banks exist but are unverified, often misaligned to current exam content, and rarely include the explanations that turn a wrong answer into a correction. This is the gap that a paid practice product like the Flying Prep CLEP US History I question bank fills: 800+ questions written and reviewed against the current College Board content outline, with explanations that link back to the underlying concept. Free is great for input; paid practice is what closes the gap.
Resource 1: Khan Academy (explanation videos)
Khan Academy's US History course is the strongest free explanatory resource for CLEP US History I. It covers the full pre-1877 syllabus across roughly 60 short videos, each 5 to 12 minutes, with quizzes after each unit.
Use it for: initial exposure to unfamiliar topics. If you finished high school US history more than 3 years ago and the named figures (Hutchinson, Jackson, Calhoun, Sumner) feel hazy, Khan Academy is the fastest way to refresh. The videos are well-paced, well-edited, and free of the partisan framing that plagues some other free resources.
Skip: the unit quizzes after the videos. They are designed for AP US History, not CLEP, and the question style differs from what you will see on the exam. Use them for self-check on Khan Academy material only, not as exam-style practice.
Frequently asked questions
How long does the Modern States voucher take to qualify for?+
About 1 to 2 hours of clicking through the course material, depending on how you choose to skim. The course tracks watched-video time and quiz attempts, but does not require you to retain the material. Click through, claim the voucher, move on.
Is the OpenStax US History textbook actually free?+
Yes, in PDF and web format. The print version is also unusually cheap (around $35 hardcover at the time of writing) but unnecessary; the PDF is fully usable on any device.
Why not just use Modern States for everything since it is free?+
The Modern States CLEP US History I course is not aligned to the current exam outline. Students who study only from Modern States regularly report scoring near or below the 50-point passing line. The voucher is what Modern States is for; its course content is not.
What about the official College Board CLEP study guide?+
The official CLEP Study Guide is around $24 in print or $15 as a PDF. It includes one practice exam and a content-outline summary. Worth the cost if your budget allows. Functionally a paid resource with a strong free-resource alternative (the covers the content outline at no cost).
Alex Stone founded Flying Prep after earning her bachelor's degree from Thomas Edison State University using 27 CLEP and DSST exams to test out of 99 credits. She built Flying Prep to help working adults and returning students take the same path.
Time budget: 6 to 8 hours total, spread across the colonial-era unit, the early-republic unit, the Jacksonian unit, and the Civil War / Reconstruction unit.
Resource 2: OpenStax US History textbook
OpenStax US History is a free, peer-reviewed, college-level US history textbook. PDF, web, and print formats. Chapters 1 through 16 cover the CLEP US History I syllabus.
Use it for: the deeper read. Once Khan Academy has built a mental scaffold, the OpenStax chapters fill in the specific events, dates, and named figures the exam tests. The chapter summaries and key-terms lists at the end of each chapter map closely to CLEP question content.
Skip: the chapter-end critical-thinking essays. They are valuable for an undergraduate course, but they do not match the exam's multiple-choice format, and time spent writing essay outlines does not translate to exam points.
Time budget: 10 to 12 hours of reading, spread across two weeks. Highlight and re-read the chapter summaries before each practice quiz session.
Free resources are abundant. Picking the right one for each phase of study is what saves time.
Resource 3: Library of Congress primary sources
The Library of Congress's US History collections hold digitized primary sources for nearly every major event the exam tests. Founding documents, presidential papers, slave narratives, abolitionist pamphlets, Civil War correspondence, and Reconstruction-era congressional records are all free to read in full text.
Skip: trying to read primary sources cover-to-cover for breadth. The collections are vast and the exam does not require deep textual knowledge of any specific document. Use the collections for targeted reinforcement of 5 to 10 events you find hard to remember.
Time budget: 1 to 2 hours total, used as anchoring for the events you struggle most to recall after Khan Academy and OpenStax.
Modern States is a non-profit that offers free online CLEP courses with a voucher for the $97 exam fee on completion. The voucher is the most valuable free thing you will find for CLEP US History I.
Use it for: the voucher. Sign up, complete the minimum work to qualify, and claim the voucher.
Skip: the actual course content. The Modern States CLEP US History I course is a large set of videos and exercises that is not aligned to the modern exam content. Students who try to study from Modern States as their primary resource regularly report scoring at or below the 50-point passing line. Use Khan Academy and OpenStax for input; use Modern States only as the path to the free voucher.
Time budget: 1 to 2 hours of clicking through the course, focused on completion (not learning), to qualify for the voucher.
Resource 5 (paid, but worth naming): structured practice
Free explanatory resources cover the input. They do not cover the practice gap.
A practice product needs three things to be useful for CLEP US History I: questions written against the current content outline, explanations that link back to underlying concepts, and a volume large enough to support spaced review (rule of thumb: at least 5 to 10 times the 120 questions you will see on exam day).
The Flying Prep CLEP US History I question bank covers all three: 800+ questions reviewed against the current outline, written explanations on every question, and a free 7-day trial that lets you cover 200 to 300 questions before deciding whether the paid plan is worth it. For students who have used Khan Academy and OpenStax for input, structured practice is the single highest-leverage next investment.
Princeton Review and REA CLEP study guides (under $25 used) are workable alternatives. They are dated (most recent editions ship 2 to 4 years behind the current exam) but the question style and explanations are reasonable. Pair either with Khan Academy as the explanatory layer.
Two free resources worth skipping
Generic YouTube history playlists. YouTube hosts thousands of US history videos at varying quality. The exam is precise about which content matters, and most popular YouTube history channels optimize for engagement, not exam alignment. Time spent watching YouTube US history videos that are not on the Khan Academy CLEP-relevant US History course almost always trades exam points for entertainment.
Unverified flashcard decks (Quizlet, Anki shared decks). Free flashcard decks for CLEP US History I exist by the dozen. The problem is they are uncurated: incorrect answers, outdated content, and partisan framing all show up. If you want flashcards, build your own from OpenStax chapter summaries (the act of building the deck is itself a study technique) or use a paid, curated source.
Putting it together: a resource-by-phase plan
A specific, free-resource-first plan for the full 30 hours of CLEP US History I prep:
Phase
Hours
Resource
Activity
1. Refresh
6
Khan Academy
Watch the colonial, early-republic, Jacksonian, and Civil War units. Take light notes.
2. Deepen
10
OpenStax
Read chapters 3 through 15. Highlight chapter summaries. Re-read summaries before each practice session.
3. Anchor
2
Library of Congress / Gilder Lehrman
Read primary sources for 5 to 10 specific events that feel weakest after the OpenStax read.
4. Drill
10
Flying Prep practice questions
30+ questions per session, mixed across topic categories. Review every wrong answer immediately.
5. Test prep
2
Mixed
Two full-length practice exams (Flying Prep or REA), 90 minutes each, with score review.
0. Voucher
1 to 2
Modern States
Click through the minimum to qualify for the $97 voucher.
If your budget is strictly free, replace phase 4 with REA / Princeton Review practice and accept that the practice quality is dated. The voucher (phase 0) is non-negotiable: free $97 toward the exam fee.
Are there any good CLEP-specific YouTube channels?+
A few. Modern States has uploaded its course as videos; same caveats as the website. Mometrix covers most CLEP exams with study tips and topic overviews. Both are useful as supplements; neither is a substitute for the structured Khan Academy + OpenStax + practice plan above.
Can I pass CLEP US History I using only free resources?+
Yes, but the gap is practice volume. Free practice question banks exist but are uncurated; the structured practice question gap is what most pass-or-fail decisions hinge on. A budget of $30 to $50 for practice (Princeton Review used or a Flying Prep monthly subscription) is the highest-leverage paid investment for students who pass with thin margins.
Drill
Colonial period for CLEP US History I: the 30 percent you cannot skip
1607 to 1763 only earns about a third of the exam, but the questions cluster around six recurring themes. Master the themes and you cover the period in 8 to 10 hours of study.
