The book written by Ferdinand Schevill is considered the best book on European history. I would seriously recommend it to anyone. Unfortunately the book has been out of print since 1930s so its a bit of a collectors item.

Please try to avoid ratta type books of indian authors. They will not widen your horizons and deepen your perception regarding European history. Secondly, they are biased to an extent, and do not help you formulate your views whichh in the end matter in CSS examination.

Hope this helps.

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Chance favors the prepared mind.