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Short lessons, built on how memory works.
Short sessions spread over days beat one long cram, so every lesson is about ten minutes.
Pulling an answer out of your head makes it stick better than rereading. Every lesson ends with practice that explains each wrong answer.
Warm-ups and practice exams mix today's idea with earlier ones, which is how you learn to pick the right tool on a test.
Right answers earn XP. Keep a daily streak, finish three quick quests a day, and unlock outfits for Biscuit. Nothing to buy, no random prizes.
Pay once. Keep it forever.
No subscription and nothing renews. Every guide and course comes with the online lessons and a printable PDF workbook with an answer key.
- Lesson 1 of every guide and course
- Every lesson of the free courses
- All of SAT Camp
- A 23-page sample workbook
- Every lesson, practice exam and cheat sheet
- Printable workbook with answer key
- Yours forever
Three guides for your three hardest finals. You save $23.
- Every guide and course, 62 today
- Every new one the day it comes out
- Every workbook
30-day money-back guarantee. Secure checkout by Stripe. Buying means you agree to our Terms and Refund policy. All-Access is $79 while we're new.
Buy once. The whole house learns.
A course is yours, not a seat. Print as many workbooks as your household needs, and check work with the answer key in the back. No ads, no chat, and no accounts for kids.
Fractions Fiesta, Kids & Allowance, Scratch for Kids and Science Lab at Home are made for kids about 7 to 12, with a grown-up nearby.
Free SAT Camp for your students, a free semester of a guide for your class, and simple yearly licenses.
For schoolsSend your notes and slides. Get lessons and practice tests for exactly what your class covers. Miss a question and it explains why, then shows you the part to reread.
Custom TutorQuestions people ask.
Is it really a one-time payment?
Yes. You pay once and the guide is yours, including any updates we make to it. No subscription and nothing renews.
What do I get when I buy?
Every lesson online, plus a PDF workbook with all the lessons, worksheets, practice exams and an answer key. Download it as often as you like.
Will it match my class?
Each study guide covers the standard topics of that class, unit by unit. Your instructor's syllabus decides what's on your exam, so check it against the unit list. Lesson 1 is free so you can see before you buy. Not affiliated with any school.
How do I get back into my courses later?
Open My library. On a new device, enter the email you used at checkout and we'll send you a sign-in link. No password to remember.
How is this different from Khan Academy?
Same big idea, but every guide here is short, has a clear finish line, practice exams and a cheat sheet, plus a workbook you can print.
What if I don't like it?
Read lesson 1 free first. If you buy and you're not happy within 30 days, email us and we'll refund you.