Any advice for getting a grade 8 in Maths and English in less than month?

Hi! It might seem like you’ve left it too late, but if you put the work in now, there’s nothing that can come in your way. For english, try and analyse a poem a day and every two days write an essay comparing them. Make your analysis is of a high level. For the other books, find key quotes from each act/ theme/ character and use YouTube for some grade nine analyisis, there’s tonnes. Do practise question upon practise question and you can certainly get that 8/9. For maths, I’d say use mathswatch if you have it and cover all of it. Alternatively, you could use dr frost maths and answer his full coverage test papers for each topic<<< they’re extremely helpful.
Hope that helps

I think to get started with revising the poetry section, make some essay plans. It's a way of consolidating what you know about the poems already and you'll hopefully have a better idea of what poems you need to learn. Then do an essay, or even just a mini-essay (like just once paragraph) to hopefully improve the way you write.
For maths do a past paper now and mark it. Then take a good look at what went wrong and relearn that area.