Thanks for reaching out - I think you've asked a question on hundreds of y11s minds at the moment!
Back when I was year 11 I created a large calendar, handwritten (you can do digital if this suits you better) - which was colour coded by subject. I allocated chunks of my free time to each of my subjects based on how difficult I found them and how much I had to revise. At the bottom of each block I'd write the topics/units I wanted to revise that day.
You may find that you have more you want to revise than time in your day - don't worry, this is normal. This is where you need to be strict with yourself. Focus on the topics you find the most difficult or you remember the least, and make sure to keep some free time for yourself so you can recharge. This also helps you study more efficiently.
I would also recommend when you feel confident in your revision then to practice past papers and questions. You can often find these on the AQA/EDEXCEL/WJEC websites, and if not then your teachers will know where to find them.
I really hope that helps, and very best of luck to you and your classmates in those mocks 🙂