I got into Nvidia through campus placements at my college.

1. CV submission
2. Written test: The written test had 4 papers: general quantitative, C programming, algorithms, and computer architecture/OS. It was objective type.
3. After shortlisting from the written test, I appeared for the interview. Topics on which I was interviewed were C programming, algorithms, etc. The contents of my CV were discussed.
4. After further shortlisting, there was an HR/light technical interview (three people were present). Mostly they asked about which layer of the software stack I wanted to work on, and my location preferences, etc.

The questions were not too difficult.

When the interviewer asked me about a particular topic, which I was not conversant in, I told him so. He then shifted his questions to an area where I was comfortable.