[eru]

I guess it depends on what you mean by university level mathematics.

Terrence Tao definitely says that doing university math changed his approach to these problems. See https://terrytao.wordpress.com/books/solving-mathematical-pr...

[saagarjha]

> I guess it depends on what you mean by university level mathematics.

Calculus.

[dan-robertson]

This definitely depends on the country. There’s a reasonable amount of calculus in high school (strictly sixth form) mathematics in the U.K. The things one tends to see in university begin with (abstract) algebra and analysis with some “calculus” topics being things like vector calculus, more generic R^n->R^m calculus and contour integration.

[eru]

In Germany we had plenty of calculus in the Abitur (like A-levels), too.

Uni adds a much more axiomatic and formal approach.