Dear student,

I hope you are doing well.

You see, Physics, maths and chemistry are compulsory subject to join btech in cs. If you have studies these 3 subject than good.

I have done my 12th in computer science. So I can say computer science is not a very difficult subject, it was really fun and interesting. First they will teach you basic coding with C language. It's one of the most basic language. With a good base you will be able to do computer science.

Note: Cs is heavily dependent on maths and logic so sharpen you skills in maths. It's very much necessary.

If you are very doubtful about yourself I can give you a simple solution. Take up a small time course to learn basic in any 1 of the computer languages eg C , c++, java. If you are able to absorb and understand well and fine. Dont loose hope in first attempt you are learning it fo the first time not necessarily you will grasp everything in 1 short go step by step.

All the best hope I was helpful.