Build a focused plan with exam-level practice. Save $1,200+ in tuition when you pass.
$97
Exam Cost
75 min
Time
3-6
Credits
~50/80
Passing
Students who have seen at least some CLEP Natural Sciences material before, need a focused refresh, and want to know what to study next before paying for the CLEP exam.
If this subject is completely new, do not treat "7 days" as a promise. Start with the free resources and wait to schedule until realistic practice is around 70-80%.
Memorizing definitions without practicing application questions, skipping weak units because they feel uncomfortable, and booking before you have taken a timed readiness check.
Confirm your college accepts this CLEP, check the required score, practice the weakest units, then use a mock or diagnostic as your final go/no-go signal.
How these questions are made: practice items are AI-generated, then independently re-solved and checked against deterministic quality gates (answer-key consistency, complete stems, on-blueprint scope). Use PrepLion to find and drill your weak areas — and confirm test-day readiness with official College Board CLEP materials too.
Unit 1: Biological Science
🎓 Khan Academy — specific sub-units
Unit 2: Physical Science
🎓 Khan Academy — specific sub-units
Unit 3: Earth & Space Science
🎓 Khan Academy — specific sub-units
Unit 4: Chemistry Fundamentals
🎓 Khan Academy — specific sub-units
Unit 5: Scientific Method & History
🎓 Khan Academy — specific sub-units
About these external resources
Links below point to publicly available third-party study materials (Khan Academy, YouTube creators, Modern States, OpenStax, College Board, etc.). PrepLion does not own, host, or modify this content. We list links as a study aid only — each resource is the property of its respective owner and is subject to their terms of service.
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Linked content may be removed, paywalled, or changed by its owner at any time. We make no warranty as to its accuracy, availability, or suitability for any exam.
The best free materials for CLEP Nat Sci. No affiliation, no kickback — just what actually works.
Modern States: Natural Sciences
Modern States (College Board partner)Free full video course. Earn the free CLEP voucher after 70% completion.
OpenStax: Biology 2e + Chemistry + Physics
OpenStax (free, peer-reviewed)CLEP Natural Sciences spans bio + phys sci — use OpenStax for each.
Khan Academy: Biology + Physics + Chemistry
Khan AcademyBroad science literacy across the three domains.
YouTube: CrashCourse
YouTubeContext videos across the natural sciences.
Links open in a new tab. PrepLion has no affiliation with these providers — we just think they're the best free options.
CLEP® is a registered trademark of College Board, which is not affiliated with PrepLion. All practice questions are original content.