Xambuster
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Every IB past paper, filed under the subtopic it tests.
940 questions from the 2024 and 2025 papers, with markschemes, flags, and a per-subtopic record of what you have actually covered.
Four banks, 83 papers
Cropped question by question from the real papers and tagged against the current syllabus, so you can revise one subtopic at a time instead of working through whole papers.
How a session goes
Pick a subtopic
Open a topic, then the subtopic you are weak on. Filter by year, or by paper type where the subject has one.
Work it, then reveal
The markscheme is one tap away. Tap the question itself to read it full size on a phone.
Record what you scored
Enter the marks you earned. Flag anything worth another attempt and it lands in your review list.
Two numbers, because one would lie
A single percentage hides how little it might rest on. These are kept apart on purpose.
Coverage
How much of a subtopic you have actually attempted. A question tagged to several subtopics counts toward each of them, because it genuinely practises all of them.
Reads as 12 of 31 attempted.
Accuracy
Marks earned against marks available, not a three-way guess. A structured question has parts worth different amounts, so scoring it as one verdict would be meaningless.
16 of 16 on a long question and 0 of 4 on a short one reads as 80%, not 50%.
Your progress is yours
Sign-in exists so your flags and scores follow you from a laptop to a phone. Nobody else can see them. There is no teacher dashboard, no class leaderboard, and no analytics vendor in the way.
You can download everything recorded about you as a file, or delete your account and its data, from inside the app at any time. Marking is self-reported and kept that way deliberately: it is a record for you, and it is never presented as a verified grade.
Start with the subtopic you keep avoiding
Free while it is in testing.
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