Khan Academy is one of the best free study tools available, but many students only open it when an assignment is due and click through problems until something works. Learning how to use Khan Academy well, with a routine, smart use of hints and the mastery system, turns it into a resource that can fill gaps from algebra to organic chemistry. This guide explains how the platform works, how to level up skills, how to use hints without fooling yourself and what to do when you're stuck.
Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. It grew out of tutoring sessions Sal Khan started with his cousin in 2004; he began posting video lessons on YouTube in 2006, and the organization was incorporated as a nonprofit in 2008. Its core content is free, with no ads.
The course library covers:
Each course is organized into units and lessons. A lesson typically combines short videos, articles and practice exercises, and each unit ends with quizzes and a unit test. Many courses also have a course challenge that tests skills across the whole course.
Search for your topic or browse the course list, then match the course to your class syllabus. If you're in college calculus but your algebra is shaky, the most valuable course may be precalculus or Algebra 2, not calculus itself. Khan Academy is especially useful for reviewing prerequisites that your professor assumes you already know.
Before watching hours of videos, take a unit test or the course challenge. Your results show which skills you already know and which need work, so you can spend your time where it matters instead of reviewing material you've already mastered.
Treat videos like a lecture. Keep a notebook and calculator nearby, pause before each worked step and try to predict what comes next. Slow the playback down for new material or speed it up for review, and turn on captions if they help you follow along. Write the video title next to your notes so you can find the explanation again later.
Watching someone solve a problem is not the same as solving it yourself. Move to the practice exercise after one or two videos, and use your mistakes to decide what to rewatch. Work each problem on paper so you can find exactly where it went wrong.
Quizzes and unit tests mix skills from across the unit, which is closer to what you'll face on a real exam. They're also how skills move to higher mastery levels, as explained below.
Short, regular sessions beat occasional marathons. Set a weekly goal, such as three 30-minute sessions or a set number of skills to level up, and put the sessions on your calendar. Khan Academy's research with classrooms points the same way: a recurring weekly routine with few gap weeks supports better results.
In a course with mastery, every skill can be worth up to 100 mastery points, and your level on that skill determines how many you've earned.
| Level | Mastery Points | How You Reach It |
|---|---|---|
| Attempted | 0 | You've tried the skill but haven't scored well enough to level up yet |
| Familiar | 50 | A solid score of about 70% or more on a practice exercise, or getting the skill's questions right on a quiz, unit test or course challenge |
| Proficient | 80 | Starting from Familiar, get every question on that skill right in an exercise, quiz, unit test or challenge |
| Mastered | 100 | Starting from Proficient, get every question on that skill right on a unit test or course challenge |
Skill levels can also drop if you miss questions on them in later quizzes and tests, so mastery reflects what you know now rather than what you knew once. Khan Academy adjusts these rules from time to time, and its Help Center has the current details. The practical lesson stays the same: practice exercises get you started, and mixed quizzes and tests confirm that the skill has stuck.
If your teacher sets mastery goals or assigns specific exercises, they can see your scores and progress. That's a good reason to do the work honestly: your teacher uses the data to decide what to reteach.
Khan Academy doesn't publish answer keys for practice problems. Instead, each problem has hints that reveal the solution one step at a time, with the final hint showing the answer. A question where you use a hint doesn't count as answered correctly toward leveling up, but you still get to see a full worked solution.
Use hints as a learning tool, not an escape hatch:
Practice exercises sometimes offer a bonus question when you miss only one problem, giving you a chance to make up for a single slip.
Searches for Khan Academy answers turn up browser extensions, answer bots and "hacks." They frequently don't work, they can expose your account or device to malware, and using them on assigned work breaks your school's academic integrity rules. More importantly, mastery points earned by a bot vanish the moment you face a classroom test. The whole value of Khan Academy is that it shows you, privately and for free, exactly what you don't know yet.
Before a big exam, use the course challenge or unit tests as a diagnostic, then focus your review on the skills that drop to Familiar or Attempted. Pair that with timed practice, as described in our guide on how to prepare for a math test. If you're preparing for the SAT, our guide on how to study effectively for the SAT explains how to combine Khan Academy practice with official Bluebook tests.
In college, Khan Academy works best as a supplement: preview the topic before lecture, then practice afterward. When your course moves faster than you can keep up, a tutor can help. Through Ace My Homework's math homework help, you can post a topic or practice problem, compare tutor bids and profiles, and get step-by-step explanations you can use to check your understanding. When you're ready, post your request and choose a tutor who fits your course. For similar strategies on another practice platform, see how to improve your IXL SmartScore.
Yes. Khan Academy is a nonprofit, and its courses, videos, articles and practice exercises are free to use without ads. You can create a free account to track progress and mastery. Khanmigo, the AI tutor, is the main exception: it's free for teachers in the US and offered to learners and parents through a paid subscription, though some schools provide it to students.
Not as an answer key. Khan Academy doesn't publish answer keys for practice problems. Instead, each problem has hints that reveal the solution step by step, ending with the answer. Using a hint means that question won't count as correct toward leveling up, but you'll see a full worked solution you can learn from and apply to the next problem.
Each skill in a course can earn up to 100 mastery points. Reaching Familiar earns 50, Proficient brings you to 80 and Mastered earns the full 100. You level up through practice exercises, quizzes, unit tests and course challenges, and the top level requires getting a skill's questions right on a unit test or course challenge. Levels can also drop if you miss questions later.
A course challenge is a test that covers skills from across an entire course. It's a fast way to see what you already know, and correct answers can level up many skills at once. It also works well as a diagnostic before a final exam: take it, note the skills you miss, then return to those units for focused practice.
If your teacher has added you to a class, they can see your assignment scores, your progress toward any mastery goals they set and your skill levels in the class's courses. Teachers use this information to decide what to review. That's why honest practice matters: if hints or guesses replace real work, the data misleads your teacher and you miss the help you need.
Yes, especially for reviewing prerequisites and practicing core skills. College students use it to refresh algebra before calculus, review chemistry basics before organic chemistry, and get a second explanation of topics in statistics, economics and physics. It's best used alongside your course materials, since your professor's exams follow the course syllabus, not Khan Academy's units.
Consistency matters more than length. For most students, several focused sessions of 20 to 40 minutes spread across the week work better than one long session before a test. Set a weekly goal, such as a number of skills to level up, and spend part of each session on practice exercises rather than only watching videos.
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