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Candidates who have studied biology as an optional subject are eligible to appear for NEET. If you fulfill the other eligibility criteria, you will be eligible to appear for the NEET exam.

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

f you are preparing for NEET 2021, you can prepare using the NEET knockout program. It is a comprehensive program for complete preparation of NEET 2021. The program focuses on concept clarity of the students as if concepts will be clear then you will be able to solve all the questions asked in the examinations.

Through the program, you will have clarity of concepts and in depth understanding of all the chapters. Time table will also be provided so that you have the pathway to follow.
Video Lectures are provided by experts which will help you  understand easily.
You can give Unlimited mock tests in this program and it will help you enhance speed and accuracy. Also, after attempting each test, you will get detailed performance analysis and you can know about your weaknesses and strengths so that you can strategize your preparation accordingly.
24*7 Doubts clearance by experts facility is also provided so that no doubt remain unsolved and you can ask your queries anytime. Check the complete details about the program here: NEET 2021 Preparation

Let us know if you have any other queries.

All the Best!

Asutosh, to be eligible for NEET, you should have Physics, Chemistry, Biology and English as your core subjects. But then the Supreme Court also passed an order Stating that Biology as an additional subject is also allowed for NEET. So if you have studied Physics, Chemistry and Mathematics as your core subjects and studied Biology as your additional subject, should you fulfill the eligibility criteria, you are eligible for NEET. And so to be eligible for NEET, you should be 17 years atleast on December 31st of the year of admission and 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.