What 90math Actually Is
90math is a Chinese online math learning platform aimed at K-12 students. It provides video lessons, practice problems, and exam preparation materials. The name comes from the idea of mastering 90% of exam content through focused, efficient study — not covering everything superficially, but hitting the high-yield topics that actually show up on tests. That's the pitch, anyway. Whether it delivers on that promise depends heavily on your situation and your kid's baseline. You sign up, place the student, and then pick a grade level and a topic. The interface is straightforward enough — a list of chapters, each with short video lectures and a set of exercises. The videos are usually 5 to 15 minutes long, which matters because attention spans in middle school aren't infinite. After watching, the student does practice problems and gets instant feedback on whether they're right or wrong. Scores accumulate over time, and there's a progress dashboard. The real value shows up in two areas: the structured curriculum alignment with the standard Chinese textbook system (, , etc.), and the adaptive difficulty that adjusts problems based on performance. If a student keeps getting a certain type of problem wrong, 90math surfaces more of that type rather than moving forward. That's useful. Most kids waste time on stuff they already know once they sit down to study alone.
I ran 90math for a student preparing for their final midterm in eighth-grade algebra. The specific problem I hit was that the platform's quadratic equation section assumed familiarity with the difference-of-squares factoring pattern, but that wasn't covered explicitly in any of the prerequisite videos. The student got stuck on problems that looked deceptively simple — things like 4x² - 9 = 0 — and the system just kept generating new variations of the same problem without explaining why the approach worked. My workaround was to pause the 90math session and pull up a separate resource on factoring patterns, then loop back. It's not a failure of 90math per se; it's a gap in how the prerequisite chain is laid out. You'll run into this kind of thing occasionally.
Downloading and Getting Started
The app is available on both iOS and Android. Search "90math" or "90" in the App Store or any major Chinese Android market. The web version works fine too if you don't want to install anything. Registration requires a phone number — either a Chinese one or an international number depending on your region. Free accounts get you access to a limited set of lessons. The paid tier unlocks the full curriculum and detailed progress reports. Pricing varies, but expect somewhere around 100 to 300 yuan per month for the full plan, depending on promotions. Before you commit to a subscription, use the free trial period thoroughly. Don't just browse — actually put the student through three or four lessons across different topics and grades. See whether the teaching style clicks. Some students find the narration speed too fast; others think it's perfectly fine. This is subjective and you won't know until you try it with the actual user.
Common Pitfalls Beginners Miss
The biggest trap with 90math is assuming that watching videos plus doing exercises equals learning. It doesn't. The platform gives you practice, but it doesn't teach metacognition — how to recognize when you're making a careless error versus a conceptual error. I've seen students rack up 80% accuracy scores and still fail their school exams because the test had questions framed in ways the platform never practiced. The exercises are well-designed, but they tend toward a narrow pattern of question types. Another thing nobody mentions: the progress tracking is optimized for the platform's own curriculum, not for external exams. A student might be at 92% completion on 90math's ninth-grade chapter on circles, but their school's test might emphasize proof-based questions that 90math covers lightly. Cross-reference with the actual textbook and past exam papers from the student's school district. That extra step takes about 20 minutes per week and prevents the false confidence that high in-app scores can create.
Who This Is Actually Good For
90math works best for students who need structured review and have some self-discipline already. It's not a babysitter. If a kid will just click through videos without engaging, the platform won't help much regardless of its quality. The time savings are real though — a typical review session that might take two hours at home with a parent wrestling over homework can drop to about 30 to 45 minutes on 90math because the system handles the pacing and the problem generation. That's the core value proposition, and it holds up in most cases. It's less useful for students who are significantly behind grade level. The platform assumes a baseline of prior knowledge, and catching up from scratch means filling gaps that 90math's adaptive system isn't designed to diagnose. In those situations, a tutor or a more remedial resource like Khan Academy would serve better before layering in 90math for reinforcement. I've also noticed the content quality dips in the later high school years. Grades 7 through 9 are solid. Grade 10 and above, the explanations get thinner and the problem variety narrows. If you're using this for gaokao prep specifically, treat it as a supplementary tool, not a primary one. The standard gaokao prep platforms in China have deeper coverage for that level.
Practical Tips That Actually Matter
Set a daily time cap. Without one, students tend to either rush through content to check boxes or get stuck on a single difficult problem for 40 minutes. Thirty minutes a day, five days a week, is the sweet spot for most users. Consistency beats marathon sessions here. Use the weak-point reports that the platform generates. They're not perfect but they're the fastest way to see where the gaps are. Spend extra time on anything that shows up more than twice in the error report. Those are real patterns, not random mistakes. Don't ignore the harder problems the system throws at you after a student gets everything right. Skipping them feels efficient but it leaves blind spots. The platform's adaptive algorithm increases difficulty gradually, and those later problems are often closer to what actual exams ask.
The offline mode works on the app if you need it, but the feature set is reduced. You can watch saved videos without a connection, but you won't get the practice problems or progress sync. Fine for a car ride, not useful as a standalone study method. There's no native English interface, so if the student doesn't read Chinese well, this isn't going to work regardless of how good the math instruction is. That's a hard boundary, not a preference issue.
