Secondary Advisory Any Advice/Interview Help Needed! PE/M&A

Hi, I got an interview coming up for secondary advisory role at a good boutique IB.

Couldn't find much of information online, any tips/advice, what to prepare for would be HIGHLY appreciated.

My current level of accounting/valuation knowledge is good enough for internship interview at IBs for M&A.

But no excel modelling experience before plus I am not sure what sort of industry specific accounting knowledge I should be aware of... any tips? I also assume LBO models over DCF?