As someone who took A Level chem from a good school, I think teaching is rather important to help you understand the concepts in the first place. Depending on how much work you're willing to do, if school doesn't offer good teaching you can still watch youtube and ask around, or maybe find a tutor, and it's doable if you put the work in. It would be really daunting at first (we started with organic chem) but it should become easier as you go on, if you don't find it any more manageable midway through year 12, it would probs be better to drop it.
One of my chem teacher was very stern but he taught well, the other was really casual and most of his classes were chatting, so that balances out.