With so much to remember on the new syllabus, it is definitely worth investing in some revision guides (you can also check them out of a library although they are in high demand the closer you get to Easter/exam times so get in there now). I often buy these myself as they make useful when planning lessons or revision session.
My favourite guides for Literature are York Notes – they do a Study Guide and a Workbook for each of the GCSE set texts and they are both good although I would start with the Study Guide. Make sure you pick up a ‘New for GCSE (9-1)’ version so it has guidance for the new specification.
CGP also produce material for revision and study – their style is somewhat irreverent and I suppose may appeal to students. I personally find them a bit cringy – like they are trying too hard – and not as in depth as I would like.
I also recently invested in some Oxford AQA books – they cover developing skills and going over the new assessment. These are very useful but also quite expensive. I have only just bought these so I have yet to delve into them in any depth but so far, I like what I have seen!