History optional from where and how?

can anyone please help me in history optional how and where i can start .i am from btech iitian from m.p pls help me and also is there anyone who doing clases or completed there history optional from gs score by piyush kumar i need help regarding notes pls pls help me guys



Baliyan sir is the most famous. He offers online courses as well. I haven't personally taken his classes but he has been praised a lot by toppers.

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