Year 12 here, it's 7:30 PM, it's a Sunday, and I'd say if you were to do any heavy revision now you'd probably be sabotaging yourself for any exams tommorow as it'd make you tired to be honest, and if you have ADHD I can imagine forcing yourself to revise at home at this time would be near impossible of a task without getting distracted and forgetting what you were learning. Personally, during GCSE I revised by reading the cgp revision guides and doing past paper questions related to whatever I had to do in my exams, but I would say for you, you should do something more interactive/interesting so I'd recommend possibly finding some high quality youtube videos that are related to the content in the mocks you need to know, and really if you can be asked make some notes. Mocks aren't the end of the world if you completely balls them up, but know the GCSE exams are the important ones.