Sure! That makes sense, since EPGY is accelerated. Good tip!

Thks for the link, question & Kriston. We are from Singapore but have never used the books since my kids are in an American international school overseas now.

Last week, the sch psychologist tested DS8 with some year end grade7/8 math papers and according to him, DS8 did extremely well. (DS8 did the WISC-IV/ Stanford when he was 6yo but they were more for his "social problems".) This made me wonder what level he is at compared to the Singapore curriculum. The link is very helpful. I will have a look at the pre-tests first.

I believe EPGY has an online placement test. Since your DS8 is so advanced, maybe you'd want to look there, too. https://epgy.stanford.edu/overview/index.html EPGY or CTY might also help with the Singpare/US math issue.