Part time internship at secured middle market lender?

I submitted an app a couple of days ago and the VP at the firm reached out for a phone interview. I'm not sure how far this is in the recruiting timeline, but I'm just kind of wondering what to expect from the interview, debt questions, etc? I did an IB summer analyst in China last year, which was not helpful in learning modeling. I know the concepts of investing(do a lot of equity research in my spare time) and finance very well, but if you drill me on specific accounting questions I might mess up. Where should I improve on before my interview in 2 days? Fit questions? Learning more modeling? Learning about secured lending? Learn more accounting? Thanks in advance.