Hello.

Hope you are doing good!

You can very easily switch to computer science in your post graduation regardless of what subjects you have taken in your graduation by appearing for the entrance examinations of different colleges and universities.

The only issue of concern is that you have to make sure that you have atleast 50% - 60% in your graduation.

Have sufficient knowledge about the subjects you want to pursue in future and keep learning.

Hope it helps.

All the very best !