advice gcse

hi, everyone I HOPE YOU ARE DOING WELL!
Can anyone please help me by telling and advising me how to study for:
- English language AQA
- computer science edexcel
- Science AQA just moved into combined higher so I must revise for upcoming mocks which I will be doing higher papers this time.
- English literature
Please anyone advise me as soon as possible as I will be having mocks soon and I really struggle with these subjects. I am very desperate to get advice about this and start following.

can anyone please help me and give advice for subjects I have listed above. I am really worried about my mocks so please help me. I am so desperate to get advice from other who can help me as soon as possible so I can focus before my mocks.
Thank you so much
I will really appreciate your advise.