I had mine yesterday, I personally felt I couldn't have really prepped for it! The interview is strength and career based so the questions can be a bit out there but the partners were so nice about repeating questions so don't be afraid to ask! Just also make sure you've researched the firm thoroughly and know why you want to work at
Reed Smith in particular. The case study was actually okay, you have plenty of time to prepare and the interviewers do prompt you a little to lead you in the right direction, everyone was so friendly and encouraging so honestly don't feel too tense! I really hope you smash it!