Ask a counselor what “most rigorous” means at your school. I suspect it’s not limited to the very few students who take every single advanced class every year.
Iirc, there are only 4 or 5 options. It may not be given to the top 20-25% of students, but I suspect it’s more broadly classified than some seem to think.
My D17 had a “most rigorous” schedule with 5AP/mostly honors, approx. top 10-12%. Our school offers 24 APs.