1. Indian Economy by Nitin Singhania

2. Economic Development & Policies in India – Jain & Ohri NCERT XI

3. NCERT XII (Contemporary World Politics) for Worldly topics and Current Affairs

4. Indian Politics by M Laxmikanth NCERT IX-XII

5. Indian Art and culture by Nitin Singhania

6.Certificate Physical And Human Geography by Goh Leong

Hello Candidate,

There are several guide books and preparation materials available in the market for IAS prelims examination but here are some of the best books which you can refer-

1. Indian Economy by Nitin Singhania Economic Development & Policies in India – Jain & Ohri NCERT XI

2. NCERT XII (Contemporary World Politics) for Worldly topics and Current Affairs

3. Indian Politics by M Laxmikanth NCERT IX-XII

4. Indian Art and culture by Nitin Singhania

Hope you found it helpful. For more details you can visit https://www.google.com/amp/s/competition.careers360.com/articles/books-for-upsc-ias/amp

If you have any further queries feel free to post it here!!