Science

In most colleges the required marks are 55% or above.

Hi,
If you have done B.Sc, doing B.ED will help in getting teaching jobs in schools. Doing M.Sc after B.Sc will help in getting college lecturer jobs (B.Ed is not required in this case).

You may refer to the following link for a list of top B.Tech CSE colleges in Chandigarh: https://www.shiksha.com/b-tech/ranking/top-computer-science-engineering-colleges-in-chandigarh-tricity/46-2-0-12292-0

Hi,
You can refer to this, it might help you:
https://www.shiksha.com/science/colleges/colleges-punjab?bc[]=100

See, firstly, your scores in class 10 and class 11 need to be really good to be eligible for science stream. But secondly, all depends on school admissions to take the final call. Discuss this matter with school authorities.
This is a very riskydecision as without studying sciencec n class 11 - it is difficult to score well in class 12. And if you think you are not comfortable with commerce you can think about shifting to humanities.

First of all, decide on the colleges. You are interested in and offering BCA. Then, visit the individual college sites and check admission procedure. Normally, the DU colleges have similar procedures. IPU has entrance exams. Private colleges also have their own entrance.