Hello Sritama Ghosh

There are many books in the market for UPSC IPS Officer Exam. Some of the important books are mentioned below.

• Indian polity for civil services by M.Laxmikanth
• Indian art and culture by Nitin Singhania
• Oxford atlas
• Indian economy hy Ramesh Singh
• Economic survey by ministry of finance
• India year book (Current affairs)
• NCERT books.

Keep solving the previous year question papers. Solve as much as you can. You can also go for extra books also to grab more marks. All the best.

Hope this helps you.