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can anyone suggest me any book, from where i can begin.
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A textbook that covers the most topics is a discrete math book. (The most popular discrete math book is by Rosen. I use the an older edition since it's cheaper.) However, the best way to study is to start with the sample problems, using textbooks mostly as references.
As to whether you even need to take the GRE CS, I don't know, but it would not hurt to e-mail a graduate advisor at a school you are interested in going to.