I thought the jump from GCSE Biology to A Level Biology was okay.
There was a slight decrease in my average test performance (from 90%-100% in GCSE to 70-80% at A Level) but it was manageable and a lot of content builds off of GCSE.
Chemistry A Level, on the other hand, was horrendous and I’m so glad I dropped it when I had the chance. The entire class dropped like flies after the first test.
There are some people who are handling the change well, though, getting really good marks in tests.
So at the end of the day, it’s really just down to the person and how confident they already are with basic GCSE knowledge.