I graduated before USE, and my math classes were... mediocre. To graduate, you had to do 10 problems of average difficulty, so our textbooks didn't even have problems harder than that.

I took a look at the entrance exam at the uni I wanted to apply to and was shocked. Thankfully, I had my dad and he went through Skanavi's exercise book with me.

I look at the USE math exam every year and it's much better than my final exam (although I like gaokao more, it has more varied problems that make you combine different areas of math), but I don't know where the cutoff point for "I won't get into trouble for my students' low results" is.