That's the new scoring. Now they have a "new" new scoring. When I first took the SAT it was out of 1600 and then when I took it a few years later it was out of 2400, and I'm pretty young. I'd assume that this subreddit skews older, so my guess is that most people here are actually older than the two of us.

I know to that adjust the old 1600 test (what most people on this thread probably took) to the new 1600 test (what OP took), you need to add 40 to the math score. Idk about reading/writing, though (what was called "verbal" on the old test).

OP got a 550 on math, which is about the same as a 510 on the old 1600 test.

The 2400 test was only around for a few years, so the 2400 SAT was more or less only taken by people born in the '90s.