hi,

see CSIR UGC NET conducts on five subjects or papers as follows:

(i) Chemical Sciences

(ii) Earth, Atmospheric, Ocean and Planetary Sciences

(iii) Life Sciences

(iv) Mathematical Sciences

(v) Physical Sciences

there is no specific instructions given for choice of subjects. the general eligibility criteria is  candidates must complete M.Sc or equivalent degree/ Integrated BS-MS/BS-4 years/BE/BTech/BPharma/MBBS securing  at least 55% marks for General (UR) and OBC candidates and 50% for SC/ST, Persons with Disability (PwD) candidates.

so you may take subjects as per your subject combinations.

you may follow the official brochure to get detailed information:

https://csirhrdg.res.in/SiteContent/ManagedContent/ContentFiles/20190426122947862Information_Bulletin_june2019.pdf