I did it last year successfully catching 18/20 things they were looking for. The TCLA courses on PE and M&A were a big help, but it is very basic stuff. They give you a bunch of docs related to a company, and you have to draft an email, pursuant to a request from a partner, to the client answering due diligence questions, and you have to use the docs (contract and loan agreement) to respond. You are given all the info you need. It is time-crunched (1 hour), so pay attention to the time! Best of luck to you all!