NEET is the medical entrance exam all over India. And for NEET, you need to complete your 12th with Physics, Chemistry, English and Biology as your main subjects. But students who want to become doctors but did not study Biology in 12th, can take Biology as an additional subject and write NEET. Studying Biology as an additional subject qualifies you for NEET. But you should score 50% combined in Physics, Chemistry and Biology if you belong to General Category, 45% for PWD and 40% for OBC,SC,ST.