Few things
a) We can't predict your score without knowing how well your school does. A B+ at a top school could yield a raw 38 while a B+ at a poor school might yield a raw 30.
b) The exam is everything. I know someone who got B+ for his English SACs, put an incredible amount of effort into his exam preparation, and cracked a 46 where otherwise he would have gotten 35-8. The guy who got a 50 in English last year his teacher thought would get ~39.
c) Your SACs will (not can, but quite simply will) be scaled up or down based on your exam result. The primary significance of your SAC results is to identify where you must direct attention with your exam study. SACs are mere 'padding', and not the foundation for a score.
If you want to predict your study scores, ask your teachers what they think. They know how well your school does and thus how someone of your grades there will fair roughly. Their prediction will be based on your marks, which are based on how relatively well you were doing at the time of those SACs. Neglecting or focusing on those subjects' exams will greatly alter your result.