Ask Byju Raveendran for a trick and he will readily whip out a pen and paper to dash off a diagram. It’s a simple geometry problem from Class 8 or 10 that he has scribbled out. But it is also a typical CAT-level question. Byju demonstrates a quick method to get to the answer. “We have a habit of making everything complex,” he says. Tricks, he says, are the result of knowing your subject in and out. A decade ago, Byju’s bag of tricks were an instant draw among friends keen to crack competitive exams.