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Study guides + timed practice tests

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Plain-English study guides for the ASVAB, CNA, PTCB and more, plus a practice bank that explains every answer, so you know exactly what to study next.

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Group buy open nowASVAB 30-day pass for $37.20, and it drops as more people join.
36 study guides15,567 practice questions
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Assembling Objects · HardTry it — pick an answer

How many identical equilateral triangles are needed to fill the inside of a regular hexagon exactly?

Example: your readiness by ASVAB subtest
GS
AR
MK
PC
WK
EI
AS
MC
AO
New

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  1. Answer 5 questions: your test date, 3 exam-style questions, and what worries you.
  2. See your weakest section and the one study guide that fits it.
  3. Get a day-by-day plan for the time you have, emailed if you want it.
Start the check → Live group buy · ASVABASVAB group buy: 30-day practice pass$37.200 joined3 more people and it drops to $35.34 for everyone, down to $29.76. Your card is only held until it ends Mon, Oct 12.See the group buy →

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ASVAB3,088 practice questionsPractice tests + guidesPTCB2,830 practice questionsPractice tests + guidesCNA2,404 practice questionsPractice tests + guidesReal Estate Math599 practice questionsPractice tests + guidesUS Citizenship510 practice questionsPractice tests + guidesCDL504 practice questionsPractice tests + guidesATI TEAS3,473 practice questionsPractice testsHESI A22,159 practice questionsPractice testsMore guidesWellbeing, parenting, AI and kids' books tooSee all guides →
How it works

Learn it, practice it, then sit it.

  1. Step 1Read the guide

    Each chapter teaches one subject in plain words, with worked examples before any quiz.

  2. Step 2Practice by subject

    Easy, medium and hard sets. Every answer is explained, so a wrong answer still teaches you something.

  3. Step 3Take a timed mock

    Real timing, a score breakdown by section, and a list of exactly what to review.

Popular study guides

All 36 guides →
Cover of ASVAB Study Guide 2026-2027
+ 3 free mock testsASVAB Study Guide 2026-2027$9.99On Amazon
Cover of CNA Basic Nursing Skills Mastery: The 37% of the Exam That Decides Your Score
+ 3 free mock testsCNA Basic Nursing Skills Mastery: The 37% of the Exam That Decides Your Score$9.99On Amazon
Cover of PTCB Exam Study Guide 2026-2027
+ 3 free mock testsPTCB Exam Study Guide 2026-2027$9.99On Amazon
Cover of CDL Class A Practice Tests 2026: Pass on Your First Try
+ 3 free mock testsCDL Class A Practice Tests 2026: Pass on Your First Try$12.99On Amazon
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