AAMC vs Third-Party MCAT Practice Tests: Which to Use (2026)

Category	AAMC practice exams	Third-party full-lengths
Administered by	AAMC (the MCAT's maker)	Commercial prep companies
Type	Official full-length practice exams	Practice exams written to imitate the MCAT
Format	230 questions, real retired MCAT items, scaled scores and percentile ranks	Usually full-length, with their own scoring scales
Price	Free sample and practice exam; scored exams 2–6 sold separately	Varies; often bundled with courses or question banks

Key differences

compare_arrowsSource: AAMC exams use questions from previously administered MCATs; third-party exams are written by prep companies.
compare_arrowsScoring: AAMC practice exams report scaled scores and percentile ranks on the MCAT scale; third-party scales vary and are often harsher or easier.
compare_arrowsSupply: the AAMC offers a free sample test and free practice exam plus low-cost scored exams; third-party sets add more full-lengths once you run out.
compare_arrowsBest use: third-party exams build stamina and expose content gaps early; AAMC exams are the best rehearsal in the final weeks.

error Common mistakes

× Burning through every AAMC exam early and having no realistic test left for the final weeks.
× Panicking over a low third-party score. Scales differ, so compare trends, not single numbers.
× Taking full-lengths without reviewing them. The review is where the points come from.

Frequently asked questions

Are AAMC practice exams the most accurate?expand_more

They are written by the MCAT's maker from previously administered questions and report scaled scores and percentiles, which makes them the closest rehearsal available. No practice test guarantees a real score.

How many AAMC full-lengths are there?expand_more

AAMC offers free official practice materials and sells scored full-length Practice Exams 2 through 6 (230 questions each). Check the AAMC store for the current list and prices.

When should I take third-party exams?expand_more

Many students use them early and mid-prep to build stamina and find gaps, then save the AAMC exams for the last four to six weeks.

The bottom line

Use third-party full-lengths for volume early, and save AAMC's official exams for the final stretch, when realistic scoring matters most.

Sources

AAMC, Practice for the MCAT exam with official low-cost products

Exam formats and product features change. Check the official pages above before you register or buy.

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AAMC vs Third-Party MCAT Practice Tests: Which Predict Your Score?

Key differences

Frequently asked questions

The bottom line

Sources

Reinforce with spaced practice

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