Hi there.

It would be best to start with the basic NCERT books. The NCERT books are available online. You should first start reading NCERT books from Class VI-XII of History, Geography, Economics and Science.

When you are done with the NCERT books go further with books like Indian Polity by Lakshmikant.

For a proper book list and study schedule please check Unacademy's website (Roman Saini lessons) and Mrunal's blog.

Start reading The Hindu daily. And be updated with current affairs. Do develop a habit of reading Yojana Maganzine every month.

Hope this helps.

Helo Nidhi, its good that you want to be a civil servant. but take this decision wisely. you would face a lot of difficulties in this. be patient and calm. Here below i have provided the link. this is the book written by Mrs. ila tripathi. she has described it very well how to prepare for ias exam, which books are necessary.

https://www.amazon.in/71-51-Journey-Failure-Success-ebook/dp/B07G2SBQNN

It is available free on kindle store. you can check it.

Thanks