I’ve had a few people message me about the Lewis Silkin AC so I thought I’d just put some general advice here! (Did it last year fyi)
The AC was very challenging tbh. Involved a written case study, group presentation, case study presentation to 4 partners, and x2 partner interviews with 2 partners each. The AC itself was one day but we had some talks/networking sessions for 3 days leading up to it. I think they might have changed the format this year so don’t take my word for it!
For the AC, my advice would be to familiarise yourself with your application. And I mean know every single detail of everything you wrote, I was grilled on one specific work experience I had for about 20 mins. Very heavy on commercial awareness, so prepare for anything and everything. The partners who interviewed me were in advertising, employment and tax so they asked me questions about that as well. Case study is relatively straight forward but the last presentation was hard since we had to do it in 10 min and it was followed by a Q&A by 4 partners.
Defo do not underestimate the AC as it was very intense and tiring! But with that being said, everyone was genuinely very nice and the interviewers are genuinely trying to get a feel for you as a person. I hope this helps, best of luck to everyone who got an AC