Citadel OA

I got an email last night inviting me to do the OA for Citadel Securities for their Summer 2025 SWE intern position. Has anyone taken it yet or had experience with this company in the past? This is my first time going through the internship process so I'm planning on cramming as much leetcode as possible prior to taking it. I also only have intro to computing and calc ll under my belt so I'm a bit nervous about questions on things like algorithms and data structures. Any and all advice would be really appreciated!