NVIDIA Developer interview questions

Took a quiz at college career fair, then had three phone interviews. There were some questions about operating systems I did not know how to answer, as I'm early on in undergraduate, but mainly data structures and sorting algorithms. Talked a lot about kernel debugging, which I had never done. Ultimately I think I simply was not far enough in classes to possess the knowledge and they seemed to need. Prepare very very well, no topic is off limits.