Does SAT Score in Middle Scool Predict SAT Score in High School?

Hi, I’m new here. I’m a mom of a homeschooled 8th grader who scored 1280 on his first SAT test on Khan Academy. Does anyone know if the SAT at this age can predict how kids do when they’re taking it for real in high school? My son has only taken a handful of tests in his life so I’m sure he’d score higher with some basic test taking strategies or more experience.