When it comes to interviews, I'm of the opinion that you either know the material or you don't.
If you want to prepare for it, spend some time with the common questions.
The first thing you will be asked at almost every interview is "Tell me about yourself". You don't need to memorize your reply, but work on a solid answer. They don't care where you were born, they do care that you have a compatible background and are enthusiastic about the field.
There are a few other common questions you should prepare for, "Why do you want to work here?", "Why did you leave your last job?", "What are your strengths/weaknesses?", "Tell me about the worst job/boss you ever had?". A bad answer to any of these will quickly disqualify you from the pool.
When it comes to the technical material, be honest and show that you are able to think and reason. When they ask a question, repeat back your interpretation of the question and then answer it. If you don't know, tell them you aren't certain but you think it is such-and-such. Or, if it is a trivia-style question, consider telling them you aren't immediately sure but you could find the answer on Google. If they want you to reason through a problem be sure you state your assumptions and state your thinking process.
If you have a friend you trust you can have them ask you interview-style questions so you can get comfortable answering them. Other than general practice at interview questions I don't see much point in cramming for a specific topic.