Hello Srijit,

For NEST 2021 there is no changes in exam pattern.

The question paper will consist of 4 (four) sections of objective (MCQ) type questions. Each section is of 50 marks each and will contain subject specific questions from Biology, Chemistry, Mathematics and Physics. It is in the interest of the candidate to attempt all sections. The merit list for both the institutes is prepared using the best 3 scores out of the four sections and the section with the worst score is omitted.

Thus attempting all sections will increase their chances of a better total score .

You can check the official brochure:

https://www.nestexam.in/docs/21/NEST2021-Brochure-Syllabus.pdf