Computer Science and Engineering

Yes, you can do CA after completing computer science.

Since you have secured more number than the cutoff and if you are from another category than general then your chances of getting IIIT or NIT is more. By the way you can get any branch in this university you want. I suggest you to work hard for JEE Advanced and try to get a seat in IIT.

You can apply only if you have completed graduation and also you should have attained the age of 21 on the year of appearing UPSC exams.

For the students of CBSE board the admission procedure is little bit different. Migration certificate is necessary to get admissions in engineering if you want to get admission in other state. With the help of migration certificate you can get admission in all of the branches in engineering.

As per me, INR 1.25 lacs per semester. The fee increases by 10% each year that is after every 2 semesters. There may be some concession in the fee if you scored 85+% in class 12th.
Good luck.

See, you cannot expect CSE or any other core branch in a government college, try out for some private university exams.

You should score around 150+ for CSE and ECE.