The PSAT is only given once a year in the fall. The junior year PSAT is the one that counts.
They haven’t taken any of the usual state mandated standardized tests either? I have no data, but I would guess that kids who haven’t regularly scored in the top 10% of those sorts of tests are likely to suddenly ace the PSAT and get a National Merit Scholarship. Grades are less predictive. There are definitely merit scholarships out there for A- students.
But xiggi as convinced me that you should study for the SAT early and don’t take it “for practice” or a “baseline” - take it seriously after some real studying. Here’s some advice about how to go about that: http://talk.collegeconfidential.com/sat-preparation/68210-xiggis-sat-prep-advice-p1.html If you google xiggi method you’ll also see someone has uploaded a pdf of compiled a summary of that advice, however I have not check it out so can’t assure you it’s safe or accurately represents what’s on CC.