For BCA or Computer Application, the Mathematics that will be required the most is the 'Discrete Mathematics'. The course on Discrete Mathematics is offered by all the colleges which offers the course of BCA. SO the Mathematics that will be required to deal with the various subjects present in the BCA course, will be the part of your curriculum itself. So don't worry regarding, you will get an amazing experience if you are sincere and regular in your studies. Be regular in your studies from the 1st day of your college, and you will do great. Don't worry much with your 10+2 combination, you would be amazed to know, that many students from Arts or Commerce also come to study BCA ad they also do great in there career. SO if they can, you will be easily able to do great in the course work. So don't worry a lot and enjoy the process of learning.

For more information regarding BCA as a career consider the link below:

https://www.careers360.com/courses/bca-bachelor-of-computer-applications

I hope this helps. Wish you a great eve!