IB Math
AA SL
AA HL
AI SL
AI HL
Strong students still lose marks when the setup is wrong.
Find the mistake. Fix the pattern.
IB Math and AP Calculus traps, explained where students actually break.
AP Calculus
AB
BC
Most errors start before the derivative.
Featured Pattern
Related Rates: the variable trap
The Trap
The Problem
Teacher's Note
You differentiate with respect to x because the picture shows x. The exam is testing t.
Open pattern
Most prep tells you what to study.
We show where your thinking breaks.
We show where your thinking breaks.