The Mistake Notebook in Math 3,000: Turning Wrong Answers into Strengths
Plenty of students work through stack after stack of questions and still see their scores stay flat. The usual reason is simple: a wrong answer gets marked, the page gets turned, and the same mistake shows up again on the next test. If you are looking for a math practice app that does something about this, the question to ask is not how many problems it has, but what it does with the ones you get wrong.
This article looks at one feature in Math 3,000 (listed on the App Store as คณิต 3,000 – ตะลุยโจทย์ ม.1-3) from ChatStick: the mistake notebook. We will cover what it does, which other tools to pair it with, and how to build a short review routine around it. The app is built for students in Thailand's lower secondary years, M.1 to M.3, which are roughly grades 7 to 9.
Why wrong answers teach more than right ones
A correct answer tells you a topic is probably fine. A wrong answer tells you exactly where your understanding has a gap. Maybe you forget to flip a sign when moving a term across an equation, stop factoring too early, or apply the Pythagorean theorem to a triangle that has no right angle. Each of those errors points at a specific thing to repair.
The trouble is that keeping a mistake log by hand takes discipline. You have to copy out the question, keep the notebook somewhere, and remember to come back to it at the right time. Most students stop after a week. A system that collects the questions for you removes the part that causes people to quit, and leaves your time for the part that matters, which is working out why you went wrong.
How the mistake notebook works
In Math 3,000, the mistake notebook collects the questions you have answered incorrectly and brings them back for repeated review automatically. The goal is practice until you have them solid, not a single quick look. You do not copy anything down, and everything you need to revisit stays in one place.
The question bank holds 3,000 questions, with 1,000 each for M.1, M.2 and M.3. Coverage follows the curriculum chapter by chapter, including integers, fractions, exponents, equations, ratios, percentages, polynomials, factoring, the Pythagorean theorem, geometry, similarity, circles, volume, trigonometry, statistics and probability. As you work through them, the notebook becomes a personal record of what needs attention across all three years.
Features to pair with the mistake notebook
The notebook does its best work alongside the rest of the app. Knowing which question you missed is only half the job; you also need to know why.
Step-by-step solutions: follow the reasoning line by line, with hints and a “common pitfalls” note to compare against your own working.
Formula library: look up key formulas with examples whenever a mistake comes down to not remembering one.
Illustrated content: number lines, graphs, geometric figures and 3D solids help with topics that are hard to picture from numbers alone.
Strengths and weaknesses by chapter: accuracy stats show which chapter deserves your attention first.
Saved favorites: bookmark any question you want to revisit, including ones you answered correctly.
A four-step mistake review routine
Here is one practical way to use it. Adjust the timing to suit your own schedule.
Step 1: Start with Daily 10 or Quick 5 on the chapter you are studying now, so the app can capture where you slip.
Step 2: For every wrong answer, read the step-by-step solution and the common pitfalls right away. Decide whether it was a calculation slip, a concept gap, or a misread question.
Step 3: Open the mistake notebook the next day and retry those questions without looking at the solution. If a formula stops you, check the formula library.
Step 4: Before a test, sit a timed mock exam, then check your chapter stats to see what still needs work.
Tip: after reading a solution, look away from the screen and explain the method out loud. If you can do that, you are starting to understand it rather than just remembering the answer.
Pick a practice mode that fits your time
A routine only works if you keep doing it, so it helps to match the mode to the time you actually have.
Mode | Best for |
Quick 5 | Short gaps during the day |
Daily 10 | Building a daily habit, alongside daily goals and streaks |
Whole chapter | Reviewing the current chapter or a weak one |
Custom set | Combining the topics you want to focus on before a test |
Mock Exam | Practicing time management under test conditions |
App information
App name: คณิต 3,000 – ตะลุยโจทย์ ม.1-3
Price: Free to download, with more than 600 sample questions across every chapter (about 20% of the total)
Unlocking the rest: watch rewarded ads for temporary access, or buy Unlock All Features for ฿149 as a one-time purchase
Ads: no ads between questions while you practice
Compatibility: iPhone (iOS 18.0 or later), iPad (iPadOS 18.0 or later), Mac with Apple M1 or later (macOS 15.0 or later), Apple Vision (visionOS 2.0 or later)
Size: 31.9 MB
Use: practice works offline, and no account is required
Developer: ChatStick Company Limited
Frequently asked questions
Do I have to record my mistakes myself?
No. The app collects the questions you got wrong and brings them back for review automatically.
How much can I use for free?
You can practice more than 600 sample questions across every chapter, see solutions and track progress. The rest can be unlocked temporarily with rewarded ads, or permanently with a one-time ฿149 purchase.
Do I need an internet connection?
Question practice works offline, and you do not need to sign up for an account.
Who is it for, and is it in English?
It is designed for Thai students in M.1 to M.3 preparing for midterms and finals or building a base before M.4. The store lists English as its language, while the description is in Thai, so check the screenshots on the store page before you download.
Final thoughts
Getting better at math is less about doing more questions and more about not repeating the same error. The mistake notebook in Math 3,000 handles the tedious side of review, which leaves you with the useful part: reading the solution and trying again.
If you are not sure it suits you, start with the 600-plus free sample questions and decide about unlocking the rest once you have tried it.
Browse more education apps on the ChatStick Company Limited developer page on the App Store
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