Hey there Nikhil , These are some of the topics mostly covered in M.sc Chemistry entrance exams - 

Atomic Structure, Chemical Bonding and Periodic Properties

Biomolecules

Chemical Kinetics and Photochemistry

Coordination and Bioinorganic Chemistry

Electrochemistry

Functional Groups

Fundamentals of Organic Chemistry

Hydrocarbons and their Halogen Derivatives

Laws of Thermodynamics and Chemical Equilibrium

Nitrogen and Oxygen bearing

Physical Chemistry

Qualitative and Quantitative Analyses

Quantum Chemistry and Spectroscopy

S and P  Block Elements

Spectroscopy

States of Matter

Transition and Inner Transition

Hope this helps , Good luck