Your typical TJ graduate could have probably begun attending college and done quite well and just skipped TJ all together.
The typical TJ grad is taking college courses in their freshman year. There was a story in the WaPo last year of a young man who graduated from TJ with enough credits he was able to graduate in a year from UVA. Granted, he took a whole lot of credits while at UVA and that did include 2 semesters and a summer, but that was pretty impressive. IIRC he majored in math and minored or double majored in a science.
My own child will graduate from her high school with enough credits to be be a 2nd semester sophomore when she walks onto campus. Good deal - saves me money! :)