I have passed my class 12th from Aligarh Muslim University in the year 1992 with PCM group. Now I want to have biology as one of the subject at my senior secondory school. This is so in order to become eligible to appear in NEET. How is that possible? Please guide me.

Having Biology as an additional subject means you should have completed your 12th with Physics, Chemistry and Mathematics or any other subject but ave Biology as an additional subject in the same Academic year. Pursuing Biology as an additional singular subject doesn't qualify you for NEET. What you can do is may be take up your 12th in NIOS again. That way you will be eligible for NEET. And to be eligible for NEET, you should have completed your 12th, passed in all subjects and secure a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. Now if you belong to OBC Category, the Category you belong to should be also listed in the Central OBC list. Or else you will be considered as General Category and so you have to secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This 50% is inclusive of the Theory and Practical marks scored in Physics, Chemistry and Biology collectively. You needn't score 50% in Physics, 50% in Chemistry and 50% in Biology separately. You need an aggregate of 50% or 40% depending on your Category as an aggregate in Physics, Chemistry and Biology. And along with Physics, Chemistry and Biology, you should also have studied English as one of the core subjects in your 12th.