What would work best and why?

Hi everyone! I’ve been using Anki consistently all through year 4 of medical school. Now I’m heading into year 5. In year 6, my big exam will cover both year 4 and 5 content.

My question is as I move through year 5, should I continue reviewing all my year 4 cards or prioritise year 5? I want to avoid a backlog especially considering I will need that content in year 6 anyway. What would it be best to do? I am based in the UK. At the moment I am seeing 345 cards but it should go down to 290 before I start year 5.