I got my interview through campus recruiting. The interview consisted of an initial one on one interview with a Manager and then a Senior Manager and then a second interview at the office (whole day, and if you get there, you likely will get an offer) I got a long with both of them very well. As such, the interview consisted mostly of me asking questions about accounting in general, KPMG as a firm, opportunities (international rotation etc), what I could expect at my first year at KPMG and so forth.
There was no tests or not any crazy technical questions. They did ask me to walk through my resume on a high level and asked me some very basic accounting questions. They also asked me about my expectations and some classic interview questions.
After this initial process, I got called back for a second interview which consisted of me visiting the office. My feeling was that I already had the offer in my hand. It was just a big presentation of the company, i.e. 5 min round table discussion with a partner or a senior manager. Then we had some group exercises but that mostly games for fun. In general, if you get to the day at the office, congrats, you're in!