Hi!
Congratulations on the AC invite! I definitely wouldn't assume that you won't convert it, and it can often go much better than expected!
I have quoted a few posts below on case studies, interviews, and group exercises - I hope they are useful!
For a partner interview, I would suggest preparing bullet points rather than scripted answers. For example, have 2-3 clear points for questions like "Why this firm?", but don't memorise specific wording. You could practice your answer at home so that you have a clear idea of what you want to say, but leave room for flexibility so that you can adapt your answer if needed.
Aside from the typical motivational questions, I have previously had questions on the following in partner interviews:
1. CV or application questions (so make sure to read back over your original application!)
2. Competency questions (e.g. "tell us about a time when...")
3. Commercial awareness questions (e.g. a news story and why it matters to the firm and its clients)
In my experience, you will rarely be asked extremely technical questions in a partner interview (such as definitions of specific financial structures) unless the interview is explicitly described as technical. They are usually more interested in how you think about and analyse commercial issues - for example, how a specific commercial issue will impact the firm and its main clients.
Good luck with the AC!!
