How we check every question
Every question passes four checks before a student sees it, and any error found afterwards is fixed as a priority and listed below.
Written by a maths expert
Original questions in the board's styles: multiple choice, assertion–reason, case study, very short, short and long answer. Never copied from textbooks or other sites. The questions are reviewed by Pete Bromfield, a former Head of Maths with examining experience and experienced teacher.
Solved again, independently
A second, independent solve of every question from the question alone, with every numerical answer checked, every multiple-choice key and every assertion–reason verdict confirmed, and the step marks added up.
Matched to the syllabus
Topics deleted from the rationalised NCERT books are removed, and every question is tagged to its chapter and topic in the current CBSE curriculum.
Checked for originality
Anything too close to a textbook exercise or a past board question is rewritten, not just renumbered.
What the checks changed
Before publishing, the independent checks replaced or corrected 200 questions: 137 in Class 10 (121 replaced, 16 corrected) and 63 in Class 12 (53 replaced or rewritten, 10 corrected). Most replacements were questions judged too close to a textbook exercise, a past board paper or another question in the bank; the rest fixed a wording, a key or a mark total. The last full review was in September 2026.
Class 9 had its second, independent examiner check in October 2026: every bank question, chapter test question, flashcard, Question of the Day and formula-sheet line was solved again from scratch. It corrected 4 questions (two mark schemes used a method from a later class, one gave a weak reason and one called two panes a kite when their sides cannot make one) and 4 lines in the notes and the formula sheet. Class 11 has not had this second check yet.
Corrections log
Errors reported after publishing are corrected as a priority and listed here with the date, the question and what changed.
| Date | Question | What changed |
|---|---|---|
| No corrections reported since publishing. | ||
Found something? Use "Report a problem" in the menu, or email pbromfield@ibmathrevision.com.