That's a fantastic score - congratulations!

Ds12 has really enjoyed taking the AMC exams the past few years. According to him, the 10 is a pretty big step up from the 8 in terms of difficulty -- I don't know whether your son has looked at old exams already, but he might want to before taking the real thing.

One good thing about it, for mathy kids who love competition, is that it's given twice each year, and students are allowed to sit for both.