Too early.
Teenage brains keep growing. So your kid is most likely to get their highest score later and also having had a few practice tests.
For now, focus on getting your kid time acommodations for the ADHD if possible. They aren’t that hard to get if (a big if) you have the fat file of testing and school accommodations going back several years. Basically impossible to get if you try to do it at the last minute.
Second, use the time now to figure out if your kid is a better SAT taker vs. an ACT taker. The PSAT is good data for SAT affinity. Many kids have a preference one way or the other.
Third, imo the best time to prep (on just the preferred test) is the summer between jr and sr year. The kid is older and smarter, you know which test to prep for, and the kid has more time to prep over the summer. Take the first available test in late August/early September.
The senior fall semester is super busy with applications, essays, ECs and school. It really helps move the process along if you are done with the testing by then. And the schools on the app list can become much more focused if you have the max test score in hand.