KKR Leveraged Credit

There's a possibility I'll go for an interview in the Leveraged Credit group at the junior level. My experience is unrelated, but I have a quantitative degree. Does anyone with knowledge of this group / leveraged credit mega fund platforms, know what to expect in terms of technical interview preparation? I would really appreciate any insights. I've already looked over the publicly-available information / credit pitch deck I found online. Kind of embarrassed to mention, but my entire education was centered around modern portfolio theory, hedge fund strategies, systematic trading (all equity focused). I know all the bond math because I took a class on it, but I don't think it covers as much as I think I need to know (essentially I'm relying on logic to connect the dots). My only professional experience was modeling debt capacity for new issuances in IB. Could anyone please recommend a resource / Sparknotes type of thing that can help me organize my thoughts on this subject and provide a clear big picture as well? I'm willing to pay for an online resource that covers it if it's less than $100 and actually helps (not just a rehash of intro fixed income class, something industry focused). Thanks a ton.