I think it's common for people to have their kids take prep courses for the SAT, esp. even if they are applying for SET, etc.
Years ago, I used to teach for Kaplan for SAT/ACT when I was in college and also MCAT when I was in medical school.
I remember I was teaching the SAT when one of the students came up to me at the break and said she found the math part very hard, esp. since she had never had Geometry.
I found it strange that a high schooler taking the SAT had never had Geometry and told her that. She then told me that she was only 10 and was taking the SAT to try and qualify for a gifted program! I looked carefully at her and realized that she was very young-looking and had a Hello Kitty pencil box!
My son took the SCAT test for CTY at age 8 and age 9 at a testing center where everybody else was around 50 years old and taking the GRE, GMAT, or some engineering licensure exam. He didn't seem to notice or care that he was the only child.
