Hi
I did AQA A-Level Biology, finished this year.
It's a lengthy course, 8 units PLUS 12 required practicals, all of the practicals need write-ups done by the second-year deadline in order to pass the practical endorsement.
The units do integrate into one another nicely apart from unit 8. There's lots of new words and terms, so if you're fine with that then it shouldn't be a problem, I know some people struggle with all the new terms.
The mark schemes are so specific, but with practice you can extract what you need from a question and get the marking points.
Overall, it's a pretty solid course, I didn't have the best experience in regards to teaching at my college, but I can't say I ever felt overwhelmed with the amount of content even when I had to teach a lot to myself.
Happy to answer more questions