Explorer
$0 Free forever
- 2 knowledge points a day, from the explanation to the final test
- 20 AI questions a day
- Level test: 2 free per subject, then 7 days apart
- Practice: drill the knowledge points you have started
Getting ready for CSCA math, physics or chemistry? Start with a 15-minute level test. Skip what you already know and study only what you don't. Every step below shows a real screen from the site, and you can read it all in 2 minutes.
Try it free. Upgrade for unlimited knowledge points, AI and level tests. See membership plans and how to buy →The website is csca.pro. It works on phones and computers, and you don't need to download an app.


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24 questions, and you can take the free test 2 times per subject; with a membership, there's no limit.

Your report tells you three things: how far off you are, what to work on first, and how many more points you can get.

The map shows every knowledge point in this subject. The colors tell you what to study and what you can skip.


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Tap a knowledge point on the map to open it. When you finish, take the final test: 6 out of 10 right is a pass, and passing earns you the seal for this section.

If you've studied it before, go straight to the final test. Not sure? Take a 4-question check first, and the parts you get right are skipped. If it's new to you, start from the beginning.

First understand it, then work through an example yourself, then practice one question right away. Finish one part before you move to the next.

In Chinese explanations and Chinese questions, words with a dotted underline can be tapped to show pinyin, English and your native language. Words you tap go straight into your word book.

AI knows which part you're reading, and its answers show where they come from. With a free account, you can ask 20 questions a day; with a membership, there's no limit. AI can make mistakes, so check its answer against the explanation.
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The menu at the bottom of the screen takes you to Practice, the level test and mock exams at any time.The menu at the top of the page takes you to Practice, the level test and mock exams at any time.

One question at a time, and you see right away whether you got it right, plus the explanation. Questions you've done in the last 7 days won't come up again. With a free account, you can practice knowledge points you've already started studying. With a membership, you can practice whole chapters and cross-chapter modules.

Questions you got wrong come back the next day, then after 3 days and after 7 days. Get them right three times in a row and you've mastered them.

60 minutes, 48 questions, and it submits automatically when time is up, just like the real exam. After you submit, you see your score, an explanation for every question, and a line showing how your score has changed. Elite includes 10, and you can also buy them separately.
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With a free account, you can start only 2 new knowledge points a day and ask AI 20 questions a day. The closer your exam gets, the more these limits get in your way. With a membership, those limits are lifted — study as many knowledge points a day as you like.
| Free account | Membership | |
|---|---|---|
| Knowledge points | 2 new a day | Unlimited, learn as many a day as you like |
| AI study partner | 20 a day | Unlimited, ask any time |
| Level test | 2 per subject, the 3rd after 7 days | Unlimited — test again after each section you study |
| Practice | Only knowledge points you've started, 2 at a time | Whole chapters and cross-chapter modules |
| Mistake notebook and review | Not available; your answers are still recorded | Questions you get wrong are saved automatically, with reminders when it's time to review; you can also see mistakes from before your membership started |
Do the math: there are 45 knowledge points in math. A free account can open at most 2 new ones a day, so it takes 23 days to open them all. With a membership, you can start them all today.
$0 Free forever
$99 / per subject, 3 months
Everything in Explorer, plus:
$499 / per subject, 1 year
Everything in Premium, plus:


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Prices are in USD. You pay once, with no automatic renewal. When your plan expires, all your learning records are kept, so you can pick up where you left off when you renew. If you upgrade from Premium to Elite, your remaining Premium days are added after your year of Elite. Mock exams are also available separately: $9.90 for one or $29.90 for six. These credits never expire and can be used for all three subjects. All purchases are non-refundable. Try the free version first and buy only when you're sure you need it.