How common is a score of 800 on the math section of the real SAT, 800 on Math SAT subject test (level 2), and a 5 on the AP Calculus BC/ Subscore of 5 on AB? I have these stats but don’t really know whether this is a widespread thing or something I should be feeling pretty good about. Let me know. Thanks.
Rare among the entire college bound high school student population, but probably not rare among the subset that has a realistic chance of admission to highly selective colleges (or highly selective engineering divisions within colleges).
You can feel good that you know high school math and college-frosh-level single variable calculus very well. But there is plenty of math beyond that if you choose to major in math.
https://sat.collegeboard.org/scores/understanding-sat-scores
There is a great deal of correlation between those who score 800 on the SAT AND 800 on the math level 2. And more so for those who score 800 on both AND 5 on the AP. Suffuce it to say that there are about 5000 or so who do as well as you. Congratulations!
I would check out the stats on some of the accepted students threads for the top lacs and unis to see the competition.