I would question if the school curriculum matches the type of questions on the SAT. My understanding is that SAT is getting an overhaul.
I also wonder how to correlate what grades should match which test scores. We seem to be entering an age where we think anything below the top 95th percentile or so is a poor grade.
But yes, parents can absolutely address why their A kid is not getting a desirable score on the SAT. I would argue that it tells you about the performance of the STUDENT more than the school.