The questions I was asked were very fair and straight forward, and the interview was more of a conversation than a test. If you've made it as far as an in-person interview, they likely just want to get to know you and hear you talk about your experience.
What to expect:
you'll have a brief interview with the HR person you've been in contact with (mostly questions about your resume what you know about H2M)
Then a second interview with the supervisor/manager that's hiring.
Definitely follow up with thank you emails and be patient to hear back - In my case, it was a couple of weeks before I was given my offer, but that time can vary depending on how soon they're looking to fill the position.