Hi, it does not really matter for what you are eligible. You can take up any course as long as your aggregate adds up to 50% in PCM or PCB whichever you choose. If you have taken biology in your lower class you can take up B.Sc. in ay field and go for any medical courses. If you have taken up PCM you can go for engineering, B.Sc., in IT, Comps etc. If at any point you feel to change your course you are free to do that as well. For all this you will have to give entrance exams. So, it is up to you what you wish to do. If you still have doubts feel free to comment. Hope this helps.