The aggregate criteria for all Categories is one and the same. According to the e-prospectus https://jnu.ac.in/admission/e-prospectus-2020-21.pdf, you should have completed your Bachelor's degree in a 10+2+3 format with a minimum aggregate of 50%. It is 50% if you have Social sciences as subjects and its 55% if you studied Science and Technology disciplines. So unfortunately with 45% you are not eligible.