For SA admissions AP test scores officially have no value, they may however look good on a nomination application to MOC. There are levels of 'AP scholar' distinctions for high average scores on multiple AP tests, these can be resume boosters.
Placement at SA is valuable if you want a minor or double major, otherwise not a big deal if you want to go the conventional single major / standard curriculum route. DS '21 placed into 'Jedi math' and advanced physics, declared MechEng and considering a Space science minor [3 extra classes.]
If cost is a consideration I would not sweat the AP tests for SA - however DS' older brother got 27 credits, BA in 3 yrs, will finish MA this May in 5th year from a good state university here. So cost is relative there - a ~$25K year of college paid for by 6 AP exam fees. Consider Plan B school impact if SA appointment does not happen.