Lmfao that's a really good score, and lol, you go to MHS, that's an amazing score.
My first chemistry SAC was about a 20/50 (yep I fucked up), but it was still a pretty decent score compared to the rest of my cohort.
You can't really use your SAC scores to predict your study score, as different schools have different SAC difficulties.
This is some solid evidence; my mate from EKC got A+ (dropped about 10 marks throughout the entire year) for his SACs in Physics, got an A on his exams, but 'only' got a 42 as his easy SACs had produced a weak cohort and therefore, his SACs had been moderated downwards while another one of my mates dropped well over 15 marks on his first SAC in Physics, did okay on the rest of his SACs throughout the year, but aced his exams and got a study score of 47.
It all depends on your cohort and final year exam.
But for a bit of fun, I'm going to have a stab and estimate your study score for chemistry to be 44.

I'm aiming for 40 lol