CLEP Study Guide
What's on the exam, which units to prioritize, the best free resources — and a 3-minute check to know if you're ready.
Pass Rate
40-50%
Published CLEP data
Prep Time
15-25h
Typical for first attempt
Units
5
Covered on the exam
CLEP Natural Sciences — 120 questions, 90 minutes, 6 credits. Covers biological science, physical science, earth & space science, chemistry, and scientific method. Passing score earns 6 semester hours of college credit (~$2,400 tuition savings). Content spans introductory-level courses in biology and physical sciences.
Unit 1: Biological Science
Cell structure, function, and reproduction · Genetics, DNA, and heredity · Evolution and natural selection
Unit 2: Physical Science
Newton's laws and mechanics · Energy, work, and thermodynamics · Waves, sound, and light
Unit 3: Earth & Space Science
Plate tectonics and geological processes · Atmosphere, weather, and climate · Solar system and stellar evolution
Unit 4: Chemistry Fundamentals
Atomic structure and the periodic table · Chemical bonding and molecular structure · Chemical reactions and stoichiometry
Unit 5: Scientific Method & History
Hypothesis testing and experimental design · Variables, controls, and data analysis · History of major scientific discoveries
CLEP Natural Sciences rewards students who've seen the question patterns, not just the definitions. Budget half your prep for recall and half for applying concepts to scenarios.
These are the best free resources for CLEP Natural Sciences. Use them, then come back here for exam-format practice and a pass-probability check.
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 Academy
Broad science literacy across the three domains.
YouTube: CrashCourse
YouTube
Context videos across the natural sciences.
Before you study anything, know where you stand. You'll get a pass-probability, a weakest-unit callout, and an estimate of hours to ready. No signup.
Don't re-watch content you already know. Drill the 1-2 units flagged as weak. Exam-format flashcards + MCQs give you the question patterns, not just terms.
Simulate the real CLEP under time pressure. Hit 50+ and you're ready to book the test. Miss it, and you'll know exactly which unit to revisit.
Full CLEP Natural Sciences prep
Complete breakdown, units, resources, pricing.
3-day pass plan
Day-by-day plan if you're testing this week.
How hard is CLEP Natural Sciences?
Difficulty factors, pass rates, what trips people up.
Exam-aligned flashcards
Free preview — 12 cards generated to the CLEP blueprint.
Free Am I Ready assessment. No credit card, no signup.
Start the 3-minute check