The main thing is that for doing computer science he must focus first on  JEE Mains and then on Advanced as college environment really matters and of course, the student's will power in computer science can take him much further far away from others if he doesn't have an interest then nothing will happen, so first get good college like IIT, and after that, if he learns much and becomes expert he will be able to take the scholarship and further he can do MS in Computer Science from Foreign Universities. He must also focus on Boards and get more than 75 percent.