CSIR – JRF(Mathematical Sciences) – Preparation Strategy by AIR 43 You can find all preparation courses by Kuldeep Singh here: https://unacademy.com/user/KuldeepSingh-1951?utm_source=Youtube_Conversations&utm_medium=KuldeepSingh_29_07_18&utm_campaign=KuldeepSingh CSIR – JRF Preparation