I know of someone who scored raw B+ in all their Unit 3 SACs, then A+ in all their Unit 4 SACs and did very well in both exams and scored 41 raw, so their Unit 3 SACs must have been scaled up. So you don't necessarily need A+ raw for every single SAC?
the raw mark itself is only an indication, only your ranking matters. In my SLA class, the students who got 50, 48, 47 did not achieve A+ for all the sacs, but they were at least rank 3 in the class. In addition, here is the secret, many teachers don't submit the raw SAC marks, they transfer your scores to a ranking of 50, 49, 48, 47, 46..., and then submit the 'internal scaled scores' to VCAA. So even someone got B+ and then 41 raw, this does not mean that it has been scaled up so much, his/her teacher might changed his/her sac score to 48+ out of 50. My student who got raw 48 (+ Premier's Award) only achieved a raw mark of 41/50 for unit 3 and 44/50 for unit 4, however 41 and 44 were the top scores, so her scores had been internally scaled up to a perfect SAC score of 50/50, and VCAA kept her perfect SAC score in the end:) This happens in almost every Chinese school. Hope it helps!