Okay, so the consensus seems to be that you can’t rely on need-based aid, and need your daughter to qualify for generous merit aid. So here’s what I’d recommend:
(1) Have her prep for the PSAT and SAT this summer. She should tackle one subject at a time, without worrying about time limits, and just keep working at that subject until she’s mastered it. Then move on to the next one. It’s an intense process, but it’s worth it for her to have mastered both of these tests by next fall.
(2) Register for the October administration of the SAT.
(3) Take the PSAT on its regularly scheduled date (likely a week or two after the SAT) and treat it like it counts - it’s NOT just a “practice test”!
A high enough score on the PSAT could qualify your daughter as a National Merit Scholar, which, in turn, would make her eligible for some very generous scholarships.
Meanwhile, if she takes the SAT in October, that gives her plenty of time to retake it in November or December if she needs to . . . and then she shouldn’t ever have to worry about it again. You’ll know her scores, and know which schools she’s competitive for. And there are several schools that offer guaranteed merit awards for kids with SAT (or ACT) scores above a certain cutoff - so you’ll know way ahead of time which of those she’ll qualify for. And if she’s applying to schools that require SAT subject tests, she’ll have plenty of time left to do those.
Since she has to do the PSAT anyway, that’s why I’m recommending that she focus on, and prep for, the SAT. But if she really has problems with it, and can do better on the ACT, then that’s the test she should go with. She still needs to take the PSAT, but she can devote most of her time to ACT prep. The PSAT qualifies a candidate for National Merit status, but it’s the SAT/ACT scores that count for all other merit awards, and for admissions. A strong SAT/ACT score is essential . . . a high PSAT score is just icing on the cake.
P.S. If you actually do live in Massachusetts, your daughter would have to score ridiculously high on the PSAT to qualify for National Merit status. The students in each state compete against all the other students in that state - and Massachusetts is full of high-achieving prep school students. That doesn’t mean it’s impossible, but she’d have to do really, really well on the PSAT to qualify. So if it turns out that the SAT just isn’t her thing, and she likes the ACT better, don’t worry about it . . . just focus on the ACT.