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