You got this. My one piece of advice that I implemented myself for my one and only interview was reading every single interview question that students had posted on my school's "interview feedback" page on SDN and I prepared an answer for every single question that has ever been asked and posted on that thread. This doesn't mean go and refine hundreds of answers from start to finish, but giving yourself a general idea of what you would talk about in case they decide to recycle these old questions. It was also fun to read some weird, out-of-the-box questions and see how fast I could come up with a unique answer, it made my mind agile.
I did this only because I had already prepared entirely for my interview, so instead of answering "why DO?" for the millionth time I decided to read those questions instead for a fun and useful exercise. Sure enough I was asked a few very specific questions that were knee deep in that thread so it paid off when I was ready for them.