The syllabus of NEST Exam is solely based on your 11 and 12 subjects. NCERT Textbooks and exemplar are considered as best books for basic preparation. You may practice Concepts of Physics By HC Verma, RD Sharma for Mathematics, OP Tandon for Inorganic Chemistry, Truman Vol 1 and 2 for Biology and JEE and NEET Question papers etc.
Solve previous year question papers for better understanding. Practice as much as you can.
https://university.careers360.com/articles/nest-sample-paper
Candidates can download NEST Question/Sample Papers from here.
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