Hello Shivam,
Yes you can. You may please analyse the pattern of the paper. Since there are 5 sections, according to the rules, General science should be attempted by all, whereas you have the choice to attempt any 3 sections out of PCMB.
Kindly read the below mentioned article for full eligibility criteria of NEST:
https://university.careers360.com/articles/nest-eligibility-criteria
Hope this Helps
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