I just followed the recommendation that it’s best to take the SAT after finishing Algebra II. They were not stressed at all. Their rigorous programs in middle school conditioned them to performing well under pressure so that was never a factor. Their current school does not really have a good history of high SAT scores. I don’t know how much more coverage of Math SAT they will get (they’re repeating Honors AlgII/Geometry for Sophs as Frosh just to get the 4 years of HS math for graduation, finishing with Calc 3 as Seniors).