Hi,
Students often tend to change their choice of subject during class 11. What matters is the subjects that are written in 12th boards mark sheet. If you have given examination in biology instead of maths in your boards examination,  then you are eligible for NEET exam as the eligibility criteria requires you to study physics, chemistry, English and biology/biotechnology at 10+2 level to be able to sit for the exam. Also you need to complete 17 years of age
as on 31st December 2020.

Careers360 is conducting the All India Talent search exam where students of 11th and 12th PCM/PCB can test their knowledge and enhance their preparation by knowing their stronger and weaker areas and win prizes and scholarships worth ₹1.25 Crore.
If you are an Engineering or medical aspirant, it is a great opportunity for you. Take the test, perform the best, avail the scholarship and win prizes.
You can win exciting prizes such as:
₹50,000/- cash Prizes, Upto 100% Scholarship on JEE / NEET AI-Based preparation packages, Laptops, Smartphones, Amazon Echo, Careers360 Almanacs, Powerbanks, Upto ₹250/-  paytm *Cashback offer
Link: https://learn.careers360.com/careers360-talent-search-exam/?icn=qna&ici=interns