Greeting Aspirant,

You can follow the Below Guidelines:

Golden Rule: Read NCERTs of class 11th & 12th diligently, word by word and every sentence. Do not miss it. It will make psychology very much clear to you.

Then come the graduate level books. There are many in the market but the one which i Suggest is Psychology by Robert Baron.

There are many topics which you will not find in either of the two sources. So, for the leftover Topics Study them from handwritten notes of Mukul Pathak Sir.

For Paper B, study Smarak Swain’s Applied Psychology. It's more than enough.

Draw Diagrams in your answers, The art of which you can learn from NCERT and Robert Baron.

Hope My Answer Helped You.

Best Of Luck For Future.