Look if you enjoy maths than give it a go, A-level maths is much more different, as in it makes more sense, its logical compared to GCSE. I hated GCSE and honestly I found it hard were as A-level maths is a general progression from one topic to the next.
Besides the grade you get in GCSE maths is not always a good indicator to how well you will do at A-level, yeah statistically people who get grade A/A* at GCSE go on to get A’s at A-level. But I don’t think that should put you off.
What topics did you find hard at GCSE? Are you the sort of person who can learn from a book, by looking at a few worked examples?
Maths is a subject that require you to get ‘stuck in’ people get good at maths by getting ‘stuck’ on questions and than figuring it out for themselves