As I recall, in h.s. the advanced math classes were geometry, trig, calculus, and Algebra II. H.S. was grades 10-12 but classes you took in 9th grade (which was lumped in with 7th and 8th grades and called jr. high) counted towards your graduation credits. That was when I took "baby math." Despite the fact that they went to a small rural h.s., my youngest two were able to take the above in h.s., plus they offered honors English and college mathematics (calculus, trig) for college credit. Both of them got their college math and English requirements out of the way while still in h.s. Parents of course had to pay for the college credit courses, but even so it was a lot cheaper than actual college tuition.
Now that I think about it, that sounds exactly like what we had. Although I distinctly remember starting Allegra in 8th grade. By the time I got to trigonometry, all the kids in that class seemingly had had college aspirations. Aka, grease monkey free-zone.