What books should one prefer for UPSC Prelims and Mains preparation? How to start studying for UPSC exam? Which optional subject should a BA student opt?

Respected Sir,

I'm B.A first year student i wish 2 prepare for Upsc mains , and prelims , In According 2 study for it What books should i prefer , how to start study , which optionals should i take ..... sir please GUIDE me .....


Thank You

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