dear aspirant,

These two are highly recommended publication when chemistry solved papers are concerned:

• IIT-JAM: M.Sc. (Chemistry) Previous Papers & Practice Test Papers (Solved) R Gupta
• Solved Papers & Practice Sets IIT JAM (Joint Admission Test for M. Sc. From IITs) – Chemistry Arihant Publication.

You can refer to NCERT books organic chemistry books of morrison and boyd for deeper understanding of the concepts.

hope it helped.