Hello Shushma,

First year of MBBS consists of mainly three subjects

• Anatomy
• Physiology 
• Biochemistry 

Best books are mentioned below for each subjects:

Anatomy 

• Netter's atlas
• 3 volumes of Cunningham
• Embryology : Vishram Singh
• Histology : GB Pal
• Neuro anatomy : Vishram Singh
• General Anatomy : BDC

Physiology 

• Indu Khanna
• AK Jain
• Sembulingan

Biochemistry 

• Vasudevan
• Satyanarayan

Hello,
.

• Physiology
• Text books of physiology
• Medical physiology
• Head and neck
• Clinical anatomy
• Molecular biology

These are some of the best and useful books for MBBS 1st year candidates.
.
As there are many other books to read and refer which are useful.Go for as many books as you want because the more you read the more you gain.