Okay. Something I know friends of mine have struggled with was having massive big revision plans with loads of content - then not having the time or mental capacity to cover that much; it’s overwhelming.
For your mocks, right now, I’d recommend finding the walkthrough/all of the topic YouTube videos for each subject/paper of the exam board you use. I think that’s your best bet for revision right now. If topics you know you don’t know come up on the videos, write it down. If you have time and the mental capacity to practice it, pick one - and learn it.
For future, I’d recommend starting smaller. Start off with the topics you don’t know, and progress for. There. Every little helps.
I hope it all goes okay xx