Hello,
There are various books available in the market for CSIR NET Chemical Sciences. But you have to choose it wisely as you should not take any risk that can spoil your whole preparation for the exam.
CSIR NET Books available in market on offline and online platforms.
Here I'm sharing name of some books that can be helpful to crack the exam.

Hope this information will help you!https://www.quora.com/Which-books-should-I-refer-to-in-order-to-clear-the-CSIR-NET-examination-in-chemical-sciences/answer/Ravi-Mahawar-8?prompt_topic_bio=1