This was not the case last year. My current 9th grader took Algebra 2 at Woodson as an 8th grader.
My DC is a 9th grader and there absolutely was an A2 class at Frost last year. Maybe there was a scheduling conflict for your child?
Then it's really hard to understand why a parent would accelerate a kid through math so quickly.
My DC is a 9th grader at TJ this year. I can see how people might think that TJ is *the* place for kids who are strong in math, but honestly it is NOT for everyone, not even for every advanced math kid. TJ requires a tremendous amount of discipline and and ability to work in a multidisciplinary way. From practically the first day, kids are expected to be able to read and comprehend huge amounts of material and to synthesize and write about it in very advanced ways. A kid who is "only" strong in math and science and does not also have excellent writing skills is going to have a very hard time at TJ.