I would recommend getting a tutor who has knowledge of beyond A level chemistry, but still knows A level chemistry topics. This will help a lot, as you can have private 1 to 1 time with your tutor at home, in your own time, who should discuss the topic you want to study in great detail, and help you understand it.
This is much better than a teacher, who may have already tried to explain it to you, but explaining the same thing in a different way will definitely help.