Hello aspirant!
Hope you are doing well

No, it is not necessary.
The guidelines according to Nta for eligibility of Neet

• Candidates must have passed 10+2 or equivalent with Physics, Chemistry, Biology/Biotechnology and English as core subjects from a recognized board
  

• The class 12 percentage required for NEET 2021 exam is separate for each category and can be listed as under. NEET eligibility marks in class 12 to be considered are aggregate marks only for PCB subjects
  
• UR - 50%,
  
• OBC/SC/ST - 40%,
  
• PWD - 45%
  

• There are no restrictions on the maximum NEET attempt limit 2021.
  
• Candidates must have completed 17 years as on December 31, 2022
  

So you need aggregate of 50% in biology ,physics and chemistry.

If you are preparing for neet, here is a link for you:
https://medicine.careers360.com/articles/how-prepare-for-neet-in-6-months


Further you can use NEET College Predictor tool to check your other
chances for MBBS, BDS & Ayush Courses.
https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

Hope this helps you.
All the best

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