This is basically depends on the college. Different colleges have different fee structure. As you want to do course in computer science than you can do bsc in computer science. The fee structure in approx 20 thousands per year in Deen dyal upadhayay college of Delhi university. You can get admission based on your score in board examination.
For btech you need to appear in jee exam and than depending on cut off you will get admission. Btech in computer science in BRCM college bhiwani haryana is approx 1 lakh rs. This is private college so fee may be less if you got a govt. College.