Don't make your decision solely on what's been said here, but to add my personal two cents, I did advanced mathematics all through high school - wasn't always great at it but I did well enough, but I wasn't really enjoying it. So I chose general mathematics for my senior years (rather than start advanced and drop) because I knew I just wanted to enjoy my final years, but still have a bit of maths in the mix *loser*.
Came first the entire two years - obviously I put in effort, but it was never any real strain and I continued to enjoy maths. As I mentioned earlier, I was able to relax with my own maths and helped out my mate who did advanced and struggled with more simple concepts.
I think there's always that fear that general maths is scaled down, and I'm not sure how true that is, but I ended up with awesome general maths scores which I would
never have gotten close to if I had done advanced, and got a pretty epic uai considering I had a pretty cruisy year and watched others crumble around me.
So basically, the point of my long-winded bullshit, is that general maths doesn't have to be a bad thing, as long as you have a go. That said, I think I'd rather suggest you try out advanced maths before bailing to general maths. I'd hate to fuck up your future.
EDIT: I should probably also add, there's never been any maths in my degree. So I can't comment on how I would've fared if my maths had been tested at a tertiary level.