Brand new to the forum, so still learning – but yes, my daughter did exactly that. She’s a strong student, and her guidance counselor suggested she prep for the tests in the summer before junior year. (She’s currently a junior.)
So, she took PSAT, SAT and ACT all within a couple months of each other in the fall. It was crazy to get seats in the summer in these Covid times, so her school offered school-day testing in the fall. Figured we should take advantage of it.
We knew from the pre-ACT and the PSAT-10 in sophomore year (which her school makes everyone take) that the ACT was her much stronger test.
And indeed, her PSAT this past fall was 1430, probably just missing the cutoff for National Merit Semifinalist (we’re in Georgia). She’ll likely get Commended Scholar, though.
Her SAT was 1420, but her ACT was 36. So she’s calling it done! It’s a huge relief to have that off her plate by fall of junior year.
(She’s in Calc BC this year, so she had sufficient math instruction by the end of sophomore year – clearly that makes a difference, too.)
So I think this strategy can work for some kids. To prep, she just took a bunch of timed practice tests in August and September.