This is what I said in another thread, but I think it will help you. I've heard someone at my school get a 50 with one SAC as a B and another person getting a 47 with one C+ SAC, but these are people who aced the rest of their SACs and the exam. Basically, one single SAC will not determine your whole study score and as long as you try hard and ace the rest of your SACs (ranking highly by the end of the year in your cohort in your SACs) and ace the exam, then 40+ is definitely achievable. I'd say 45+ and maybe even 50 is still achievable provided you ace everything else. These examples are from English not further, but in multiple subjects I've heard of people going from really low SAC grades to 45+ study scores. For example, in specialist maths, I've heard someone go from a C+ first SAC mark to a 47 (this is different to the above example which was for English). So, as long as you try hard and do your best, you can still achieve amazing study scores.