Hello student

If you have got gress marks in any optional subject oyher than physics,  chemistry and biology then you shlould not worry. But if you have got gress marks in one of the pcb subjects then , it is must to have got more than 50 marks in other pcb subjects.  I mean to say that you should get total 150 marks in physics,  chemistry and biology.

If you have got 12 gress marks in physics then your total score in chemistry and biology must be 50 +50+12=112.

Eligibility criteria for neet - The candidate must be an Indian

The candidate must get minimum 50% marks in physics , chemistry and biology .

https://medicine.careers360.com/articles/neet-eligibility-criteria