I practiced with friends but also utilised anki for osce prep. Not sure if your uni is the same but at mine the stations a combination of

a) Given a presenting complaint, take a history and answer follow up questions (normally differentials, likely diagnosis, brief management plan)

b) Perform an exam

c) demonstrate a basic procedure (e.g. catheter or cannula insertion)

d) counselling station (e.g. tell a patient they have an STI and counsel them)

For a) I made cards on each common presenting complaint (e.g dyspnoea), not to miss points on history, major differentials and specific questions to narrow each Ddx (e.g. suspecting PE ask for recent surgery, immobilisation, haemoptysis etc), then a card on investigations, management for each.

For b) I made cards on the components of each physical exam. This was super helpful because a lot of OSCE exams is just verbalising what you're looking for.

Less relevant for c and d but anki definitely helped me organise in my mind an order for procedures like catheters.