Maths is not the concern at major level. You can crack CAT even if you start now but it depends upon your passion to clear the exam.
Time is less so how much time you dedicate to the preparation daily and how much you give time on revision and other aspects that matters.
So give a target to yourself daily and action accordingly.

Take crash course if you have no idea about how to start for CAT Exam.

Give online/offline mocks to analyse your preparation and know where to get into detail.
Try not to escape topics but t does not mean you stick to one and does not move on.

Hope this helps you.
GOOD LUCK.

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