I agree you don't want to push your son, but make sure he stays engaged in school and most importantly learns how to study. I just finished my freshman year of college and barely scraped together a 3.0 GPA. I lost my full tuition scholarship and my honors scholarship because I didn't know how to study. I was offered a chance to take the SAT in middle school like your son but didn't for one reason or the other. Throughout high school I NEVER studied because I didn't have to. I wasn't straight A, but had a 3.8 something GPA at graduation. I just drifted through and did the minimum to get by but never had to work very hard. My first semester of college I finished with a 2.4 GPA because I didn't do ANY homework or studying. The first half of the semester I just didn't because it wasn't required, but by midterm when I realized I had Cs in three of my classes I tried to study but really didn't know how. All this is still a ways off for you son, but it's just something to keep in mind.
Congrats on your son's test score, it must make you proud
Ben