For most of the colleges, if you wish to get BSc CS then you need to have Mathematics in 10+2. PCB students won't be eligible if they don't have Mathematics. Now if your college allows you then its a different case, but in general most colleges ask for Physics and Mathematics in 10+2 in order to be eligible for BSc CS.

Some of the colleges offering BSc In Computer Science:

VIT Vellore - Vellore Institute of Technology

Chandigarh University, Chandigarh

YCMOU Nashik - Yashwantrao Chavan Maharashtra Open University

Sathyabama University - Sathyabama Institute of Science and Technology

Gandhigram Rural Institute, Dindigul

For more colleges you may visit the link below:

https://university.careers360.com/colleges/list-of-bsc-in-computer-science-universities-in-india

To know more about Computer Science visit the link below:

https://www.careers360.com/courses/computer-science-course

I hope this answer helps. All the very best for your future endeavors!