You need to check all BSMD programs websites you are planning to apply to understand their policies on superscoring for Fall 2022. IMO, predicting superscoring policies for Fall 2023 is too early, but you can get a trend if you study Fall 2022 policies for BSMD programs. Below is SAT to ACT conversion chart. IMO, if your son is trying ACT then aim for a full score of 36. There were many accepted in BSMD programs with SAT score of 1550 and around for the Fall 2021 cycle. I suggest you to check out the results thread, and do your own study. Good luck.