Hello,

CAT exam just needs a bachelor's degree from a recognised university and there is no requirement for maths in STD 12th but for 10th schools usually have maths as their subject and also CAT exam has portion which contains concepts like numerical ability, percentage, probablity, profit and loss etc. So these are all concepts we learn till std 10. Well if you are good at maths without having it in your std 10 or 12th then it is good. If not you can approach some online courses providing certificates too.

Check out this link below for detailed information

https://bschool.careers360.com/exams/cat