With simple graduation (BA)/post-graduation (MA) as my background what should be my strategy for Prelims?

With simple graduation (BA)/post-graduation (MA) as my background what should be my strategy for Prelims? 

Ans:-

It may sound absurd but the best way to prepare for Prelims is to prepare for Mains first. Generally, for Prelims, the questions asked can be grouped into two broad categories : factual & conceptual. Conceptual questions can be handled more effectively only if Mains is prepared first. Besides, objective facts can be related and remembered easily only when a sound conceptual base is pre-existing. 

Therefore, your strategy for preparation of Prelims should be such that you are thorough in your first optional (that you take in Prelims as well as in Mains) as also in G.S. This is important because you do not get enough time after Prelims to prepare for the Mains.

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