Yes,

You can freely take maths with pcb in (CBSE) . The only Problem here is depends on college/university policy and terms conditions. That should be Full filled.

Here how,

In Your university you have to inform them at the time of registration/ admission.

It's also depends on category like general or private and etc. after 12 you can also enroll for course of centre and nois to take maths in pcb

Boosts your career, it helps you .