I did BSc(PCM) and now i want to learn psychology. how can i prepare for entrance test of MA in psychology for DU/JNU/BHU?

I did BSc(pcm) with 57%, and now doing job in MNC (banglre) and getting good package also. but i am not enjoying, i wanted to learn psychology in depth. and want to apply full time MA in psychology in DU/JNU/BHU. so could you please guide me how can i prepare for entrance test to clear.