Good luck! You're gonna smash it! Are you doing edexcel chemistry?
I used Ma chem guy even though he based it on OCR but he explains concepts really well he starts from the basics and builds up on it that really helped my understanding.
Allery chemistry was helpful too he has good topic summary videos.
Physics and maths tutor is very helpful with exam questions. Don't limit yourself to new spec questions do the old unit papers but refer back to the specification to see if it's still relevant. Study mind is also good for exam questions based on each topic.
There's this book that I bought from amazon but i got it quite late so I wasn't able to finish it. It's called exam insights
https://www.amazon.co.uk/Insights-level-Chemistry-Inderpal-Kalsi/dp/1510481192/ref=mp_s_a_1_26?keywords=chemistry+exam+book+a+levels&qid=1669768903&sr=8-26This was really helpful in terms of exam technique and what the examiner is looking for it has questions on each topic.
Chem guide and chem revise are both great resources and build your understanding. I think understanding chemistry is the biggest hurdle because that will help you apply the knowledge in the exam.
Use the blurting technique where you're writing about a topic on a blank piece of paper from the top of your head I wish I did this more!! At the end of the day you'll only have your mind as your only resource so make sure that you know your topics inside out.
Please learn the practical techniques!!! I feel like I lost the most marks on this in the exam! I remember in the CGP revision guide they had a section dedicated to practical techniques where they tell you about what equipment should be used when don't over look it!
I also used tailored tutors for chemistry. It is expensive so I used it closer to the exam time. It helped clear concepts and strengthened my understanding. They also have a lot of mocks that they've curated and I love their videos that went through them. This also helped my exam technique. Sorry I know this is quite long! But good luck and if you need anything let me know.