Ask about valuation methods (DCF, Comp transactions, Comp companies). Other topics asked may include Relief from Royalty, Contingent Consideration, how to select comparable companies or precedent transactions, or specific questions about the DCF.
Sigiloso
To prepare for the case interview part, I would do Rocketblocks. To prepare for the technical portion, I would look at the accounting, enterprise/equity, valuation, and DCF section of the 400Q guide. Some interviewers might ask you in detail about a current event in the financial world.