Hi Emma! I did my GCSEs this year and was predicted 9s in most of my subjects (I also got grade 9 in these on results day) so hopefully this helps.
I think ways to revise depends on the person but it sounds like you're in the same situation I was in at this point in year 11 because I thought English lit and language were going to be the exams that I performed the worst in. Turns out I got a 9 in both of them though which was mostly just from going over everything and practicing writing my answers.
In lit my school provided us with loads of essay plans so we had a way to answer every possible question that could come up on the exam - they had 3 or 4 paragraphs on them for things like Macbeth but most people chose to write 3 paragraphs with 2 quotes in each, probably because none of us could write 4 massive, detailed paragraphs in 50 minutes (for Macbeth the main essays were Macbeth, Lady Macbeth, Kingship, Macduff and a few others which were based off of themes such as ambition but most of these themes came under the character essay plans). My advice for English lit is to memorise essay plans and make sure you know how to fully explain the quotes that are on your essay plans (explaining quotes is basically picking out a few words and talking about what each word suggests in general and about the point in your paragraph). There might seem a lot of content to go through and remember but you could narrow it down by picking out quotes that would go with multiple essays, then you don't have to remember as many. Honestly, at the start of year 11 I didn't feel confident in lit at all but after practicing writing up essays and learning quotes I felt really prepared for my actual exams and if you're already predicted a 9 then you should be absolutely fine, no matter the way you choose to revise.
For language, you can't really revise questions 1-4 apart from remembering how long you should spend on each question and the things you need to pick out from the text on each one. For question 5 you can definitely revise a pretty good answer; for paper 1 I came up with a piece of descriptive writing, planned it out, and wrote it up, then I kept going back to it for each mock to improve it so it would be the best I could write. For paper 2 I did a similar thing but planned out paragraphs for different issues that I could talk about in non-fiction writing (e.g. environment, education, health, economic, social) then chose a few of them that would fit together in my answer. If the answers that I revised didn't really suit the question, I would edit them slightly so that they would make more sense.
For other subjects I would make a list of topics and revise the things you're not sure about first, then go over the other stuff if you want, but I wouldn't worry about keeping a strict revision timetable if it doesn't work for you as I tried to do this as well but just ended up revising what I felt like I needed to revise most.
Apart from that I would just revise if you think it would make you feel more confident and prepared, but don't do too much or overwhelm yourself. It's really important to balance your time and not spend it all revising, especially in the first part of year 11. Also, if you don't get the grades you want from mocks, don't worry you've got plenty of time to see where you need to improve and if you're predicted 9s then you should do great. Ultimately, ask your teachers for advice, revision materials, essay plans if you need them, or even if you just want to chat and you'll be fine.
Hopefully this helped and I didn't go off on a tangent too much. Hope you do well in your mocks! (also sorry if this is a bit of a long answer, I got a bit carried away with the English revision paragraphs lol)