I disagree with most of the advice here. There's only one thing you need to be able to do: buy the "Elements of Programming Interviews" and be able to solve any

I disagree with most of the advice here. There's only one thing you need to be able to do: buy the "Elements of Programming Interviews" and be able to solve any problem in it within 30 minutes. Cracking the Coding Interview's questions are way too easy. If you buy the book and study those questions you're just going to be disappointed that the questions you actually get are much harder.