@snood,
I have no idea why they was not in the courses as anyone who wish to take the advance courses at the time could sign up for them.
There was no force selection for those courses by the school administration so you can not blame them for keeping the black students or anyone else out of them instead of taking so call business math and general science courses.
As far as my superior intellect I am still amused that the so call school guidance counselor once told my father that I was an over achiever and not as bright as I thought I was.
Despite my top marks in such subjects if there was a way of blocking me from taking those courses and by doing so interfering with the honor roll students class rankings I am fairly sure they would had done so.