Our kid’s PSAT went up only 10 points from sophomore to junior year, but high enough for NMSF both times (1490 to 1500).
Interestingly, they made 5 or 6 total mistakes in 2018, but only 2 in 2019, which we attribute to a slight bit more maturity in being willing to go over the answers more carefully. All but one error both times were silly mistakes.