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CAT is an aptitude test rather than a syllabus test, and that changes what preparing for it means. The quantitative section draws on school arithmetic, algebra and geometry rather than on anything taught in a degree; the difficulty is not the mathematics but the clock, and deciding within a few seconds which questions are not worth starting.
It is written in three parts — verbal ability and reading comprehension, data interpretation and logical reasoning, and quantitative ability — and business schools commonly look at how a candidate did in each part as well as at the overall score, so one weak section can hold back an otherwise strong result.
Most candidates are final-year undergraduates or people already working, preparing in the evenings around a degree or a job. Tuition at this stage is less about covering ground and more about diagnosis: going through attempted mock papers, fixing the order questions get taken in, and rebuilding arithmetic that has not been used since school. A mock score on its own says what happened, not why.