Hi! I'm doing Edexcel EngLit, sitting exams this year (next month! aahhh). I found it sooo difficult at the start of y12 but don't be discouraged as everyone improves by a good few grades from the start of y12 to this time in y13 (e.g. I started off around a C but am now getting A*s/As).
I'd really recommend focusing intensely on the prose novels as there is just so much to know about them. Make sure you know the books inside out and (if possible) get the same copies as you'll have during the actual thing, so you become familiar with what happens whereabouts in the book. Also make sure you're very good at comparing your two texts - have precise scenes/quotes to compare.
For the Shakespeare, make sure you have a good selection of critical quotations that can be used in all essays, as well as a few specific ones relevant to major themes.
In the pre-1900 poetry (not sure the date is right there, but basically not the modern stuff), have good poem pairs to compare based on themes, you don't want to be panicking in the exam trying to figure out what on earth your second poem will be - time is soo tight on that exam!!
Remember, you get all texts in the exams, so learning precise quotation isn't as strictly needed as at GCSE, but is still important - you don't want to spend half the exam flicking through the texts!
Coursework is also 20%!! It's honestly not as daunting as it seems, make sure you have a good record of all your referenced material (I recommend using a bibliography manager like Zotero, it made my life so much easier). It ends up being like 4/5 points of comparative analysis between your text to meet the 3000 word limit which really isn't that much. Don't stress too crazy about it, but again it is 20% and it's a good feeling to know you've got that in the bag before you go into exams as a bit of padding.
Most of my revision consists of essay plans, focusing on past papers primarily from Edexcel but when I ran out of those I looked at some from the other boards and adapted where appropriate into Edexcel's format. Of course, also flashcards for quotation memorising, but I figure you already have to do that for LitLang.
I can send you copies of some of my most recent mocks if you PM me and I can figure out how to, lol. For reference, I do: A Streetcar Named Desire & Othello (Paper 1, tragedy); Wuthering Heights & A Thousand Splendid Suns (Paper 2, women and society); Post-2000 Poetry & The Metaphysical Poets (Paper 3).