These IAS Preparation books are categorised into Prelims and Mains books. There are some free e-books as well.These books must be selectively bought and more emphasis should be on NCERT and few standard books.
Upsc General Studies Books Pdf Free Download
Apart from books, the main backbone of IAS exam preparation is understanding current issues very well. Hence, newspapers especially The Hindu is indispensable.Links given in each book lists directs you towards Filpkart or Amazon websites. These links are Affiliate links. If you buy these books, Insights will get commission. Thank you.