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About Mindstair

Mindstair is a free study site for high school and college students.

It has study guides, flashcards and practice questions for 42 courses, from Algebra 1 to Organic Chemistry, plus 20 full-length SAT practice tests. Every practice question has a written, step-by-step solution, and questions are sorted into five levels so you can climb from the basics to test-day difficulty.

Where the content comes from

All study guides, flashcards and practice questions on Mindstair are original. They are written to match what each course commonly covers, not copied from textbooks, test makers or other study sites.

How the site stays free

Mindstair is free to use and supported by ads. Ads only appear in normal page spots, never inside a timed practice test.

Your progress

You can study without an account; your progress is saved in your browser. Make a free account (email and password, or Google) to save it and use it on any device.

SAT and AP are trademarks registered by the College Board, which is not affiliated with, and does not endorse, Mindstair.

Questions or found a mistake? Email hudsonrose241@gmail.com.