BTW I do think that it is better to use a test that is only taken once on a fixed schedule by everyone, like smarter balance or PSAT (though my recollection is that SB was trivially easy so it wasn’t helpful in differentiating at the top end).
A single sitting does mitigate some of the advantages of wealth that allow rich families to take the SAT/ACT as many times as they like until they get the desired result.
And as far as teaching to the test in class goes, that doesn’t happen for PSAT (which can be worth hundreds of thousands of dollars to NMFs) so it is unlikely to happen for SB. External prep may be a different matter, but it’s at least better than what we have now, where rich kids get multiple chances.