How long does it take to do CS and how many exams do you have to atempt?
Hello dear aspirant.
Computer science engineering is a very good branch in which you can progress as much as you want. In order to get a good college like IIT and nit you have to give JEE mains and advanced exam. For state level colleges you have to give state level entrance exam. More than few other private colleges conduct there own exam also like BITSAT etc.
Hope you get it.
Good luck