It was my understanding that in US people take SAT after finishing high school and use these scores to enter universities. But this quiz looks like it's intended for 10 year olds.
Do I misunderstand something here?
Edit: here's my own frame of reference for a math level of a 16-17 year old just out of school. Problems are definetly harder than average, but nothing out of scope of state-approved math curriculum:
http://new.math.msu.su/admission/exams-write.html
(Russian, but understanding the language is not necessary for half of the problems). Of course, I expect a general exam to be easier, but not so drastically.