Should I drop out of A levels?

Hi,
So I have been thinking A LOT recently and reading different threads about the topics. At AS I achieved CDEU in my subjects and dropped the subject I got a U in. Looking back now I should of retook the year at a different sixth form but at the time I didn't think of that option. I am now struggling with A level and trying to revisit all the topics from last year, although my grades so far have not seen any improvement. I was wondering would it be more worth my time to start an apprenticeship, or open university? See I am interested in neuroscience and currently study Chemistry Biology and Psychology, I just don't want to get to A level results day and feel the same disappointment, as well as knowing I could of done something to fix the problem sooner. If possible I would love to get the grades and go to University but with how it is going right now I am not sure if that is possible.
Thanks in advance!