You should look at the charts and esp. the % for those who took it as the same age you did ( grade 9). My kids took it in 7th grade scores were not 1600 but they were 99%. Be mindful that many taking it early are naturally higher scoring since the only reason one needs to take an early SAT is for gifted programs like CTY and Duke or for a handful of scholarships for Gifted kids ( Caroline Bradley).
It’s generally not a good idea to take it in 9th grade as it stays on your record while the younger kids scores are deleted.
I did read somewhere that score rise roughly 60 points a year without prep.