GCSE Time management and revision/studying

I'm in Yr 11 and I'm currently preparing for my mock exams in January and working towards my GCSE's. For a majority of my subjects bar economics(ocr),Unit 1,2 and 3 Science(aqa) and maths(edexcel) revision won't be too long. However for the three subjects I mentioned how do I manage to revise efficiently knowing I'm a slow learner when I comes to these subjects as I find them quite technical. Additionally, how can I revise Unit 1,2,3 for all my sciences effectively because I feel I will revise ineffectively and fail so any advice would be good, especially as I struggle with Science generally. To add, how do I effectively manage my time amongst my difficult subjects(maths, science, economics) so I understand it and can answer questions without jeopardising my knowledge on my better subjects e.g. history(edexcel). Lastly, do you have any effective studying strategies to enhance recall and make it easier to comprehend and understand topics you may find had for any subject. This is because in class I believe I learn better when I'm not in school, yet my performance and results still aren't good enough for my A*/A target grades and I want to succeed.

Look at your exam boards specification for each subject and practising exam paper questions. If you have any queries you can always message me on here or on get revising because I can make some resources for you if you want to. Its free to make an account
https://getrevising.co.uk/

Thank you, but I already know about past papers I'm talking about managing to efficiently revise the 3 subjects I'm slower to grasp understanding especially as my AQA Science Specification has a Unit 1,2 & 3 for each of the Sciences I must remember in addition to my other subjects.I also asked about how to effectively manage my time amongst my difficult subjects(maths, science, economics) so I understand it and can answer questions without jeopardising my knowledge on my better subjects e.g. history(edexcel) as well as any effective studying strategies to enhance recall and make it easier to comprehend and understand topics I may find hard for any subject

O ok. well basically don't spend longer than an hour on anything that you are doing. Take 15-20 mins break in between. Make sure in each hour you are doing a different subject