Hello,

Firstly CSIR NET is mainly for science subjects such as mathematical science/chemical science/earth science/biological science/physical science, the eligibility criteria for CSIR NET is passed BTech/BPharm/BS degree of four years/Integrated MSc or BS-MS securing 55% aggregate, there is relaxation of 5% for reserved categories,  in case of JRF the upper age limit is 28 years, there is relaxation of five years for five years for OBC/SC/ST/Transgender/Women candidates, in case of lectureship there is no upper age limit.

so to answer your question you can go for any subject selection or degree choice as per the eligibility criteria laid out by CSIR NET, if you want to go for integrated MSc then you may choose any field such as physics, chemistry, mathematics, biology/life science to name a few,

explore more details regarding CSIR NET, visit our page at https://competition.careers360.com/articles/csir-ugc-net