National Eligibility Test is conducted for admissions to M.sc and other science programs in India. You need good NET Physics Books and coaching to crack it. Books for it are-Thermal Physics: Heat & Thermodynamics, Mathematical Methods in The Physical Sciences, Waves and Oscillations, Classical Mechanics, Nuclear Physics, Introduction to Electrodynamics, Digital Fundamentals, Introduction to Solid State Physics. There is NET Physics Coaching In Delhi. You can research about them and take admission according to your liking.