S took the ACT, SAT, and 3 subject tests all between April & June of 2015, at the tail end of his senior year. He looked at where he was considering applying (no HYPS), where he would be happiest attending, and called it done. He was well within range for the schools, and it’s worked out so far in the EAs he’s heard from.
He knew he was going to have a full slate of stuff to get through Senior year, and while he probably could’ve raised his Math SAT, his Math subsection on the ACT was great, so he didn’t bother. “If a school is going to reject me because of a score on my Math SAT despite a 36 on the Math subsection of the ACT, it’s not a place I want to be.” He just sent all scores to all schools, figuring that if nuances like that were going to make or break a decision, it was a game he didn’t want to play and it’d be a way of making sure he didn’t end up somewhere that took testing too seriously.
So far, so good.