Hello candidate,

Here is a list of some of the best books you can refer for preparing for IAS Mains examination-

India's Struggle for Independence by Bipan Chandra.

India After Independence by Bipan Chandra.

Ancient India by RS Sharma.

History of Medieval India by Satish Chandra.

From Plassey To Partition And After by Sekhar Bandyopadhyay.

Introduction to Indian Art for Class XI (NCERT).

Indian Polity for Civil Services Examinations

Indian Art and Culture by Nitin Singhania (Culture)

Certificate Physical and Human Geography by Goh Cheng Leong.

Oxford School Atlas by Oxford Publishers.

Indian Economy by Ramesh Singh (Economy)

Hope you found it helpful. If you have any further queries feel free to post it here!!