Hello,

You haven't mention you're seeking information regarding study materials of which subject. Anyway, for Paper-I, you can go through NTA UGC NET/SET/JRF-Paper I: Teaching and Research Aptitude by Pearson or Trueman's UGC NET/SET General Paper-I.

Practice previous year questions, mock paper to evaluate your progress as well as get acquainted with the type of questions that'll come in exam.

In addition to this, I can say no matter what your subject is, but going through your graduation and post-graduation books are must, one needs to have that thorough knowledge when it comes to cracking NET.