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Hello Sohan,
You have to read at least 7-8 hours daily and revise daily,
Below i am sharing the books to refer and read Important for IAS Exams.
Indian polity by Laxmikanth
GC LEONG for geography
SANJEEV VERMA for economics
A brief history of modern India by spectrum
6-10 class NCERTs of all the related topics like science, geography, social sciences etc. 11-12 class NCERTs (art and culture, modern history among others), read selective chapters.
Apart from these five sources, you DONT need to purchase any book. There is a lot of other material which one needs to read selectively though.
Selective reading of economic survey.
Environment and ecology notes by Shankar IAS
International relations of Vajiram
The Hindu daily
Yojana every month
Lexicon/G Subba Rao for ethics
Small topics like disaster management, security, irrigation, left wing extremism, cyber security can be covered from internet sources like Mrunal, Wikipedia, Unacademy - The Free Education Revolution! etc. No need to buy books
Solve PYQs from Upsc website (5-10 years).
Get some MCQ booklet for practice (can be avoided if you are joining a test series)
Avoid reading India year book, Manorama year book, Penguin year book, Ostrich year book etc. Waste of time. Cost benefit ratio is bad.
Take care of your optional, till the time it is not removed by UPSC.
Don't buy any book for CSAT-2, if you are good at it, you won't need it. If you're bad with numbers and reasoning, it won't help.
Buy how to crack CSE interview book by Madhukar Bhagat.
UPSC CSE preparation strategy along with best books for prelims as well as mains exam for sure success.
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