Dear Rohan, ideally for you to be eligible for NEET, you should have completed your 10+2 with Physics, Chemistry, Biology/Biotechnology and English as core subjects. And you should be atleast 17 years old. But if you have studied B. Tech, you can still appear for NEET based on your highest qualification which will remain 10+2. But the catch is that you should have studied Biology as a subject. If you have studied Mathematics, then you can take up Biology from an Open School and appear for NEET UG. Hope this helps.