For MSc Chemistry preparation some of the books which can be useful to you are: Organic Chemistry Francis A Carey Morrison and Boyd Organic Chemistry Clayden Reactions ,mechanisms and structures by Michael B Smith,Jerry March. Inorganic Chemistry James E. Huheey Puri, Sharma and Kalia

These books will help you with the preparation for Msc Chemistry entrances for not just DU, BHU but other exams as well.

Good Luck!