My Son Will Graduate High School at 14 - Which of the 3 Big Schools Would Be Best?

[Carnation]

TESC requires a simple letter of appeal stating that you have graduated high school and accumulated at least 24 college credits in order to bypass their age requirement.
You don't need to do this until you enroll when he is closer to finishing his degree.

I would recommend you start working on CLEPs while he is doing high school.
The first two years of college is a repeat of much of high school.
When he finishes a subject in high school, he can study the REA guide, maybe IC cards, then go take the CLEP so he can receive college credit.

For homeschoolers who take advantage of CLEPing, it is not unusual for them to graduate with a college degree by 18yo.
My son is advanced and will have completed his degree while his age mates are still in high school.
My son has looked to the founding fathers of the United States as his example.
Many founding fathers had their college degrees and were apprenticed to a career while in their teens.
Amazon has a book about a family that homeschooled their kids 20 years ago having all their kids graduate with degrees while still in their teens.
Amazon.com: No Regrets: How Homeschooling Earned me a Master's Degree at age 16 (9780962361104): Alexandra Swann, Joyce Swann, Glen Holbrook: Books

Best wishes