In terms of math, you will want to have at least a decent understanding of derivatives and integrals, as well as "basics" like logarithms/exponentiation, trigonometry and sums.

While it goes through vectors and such from the bottom up, it does so quite quickly so will probably be a bit steep if you haven't had any linear algebra from before.

Partial derivatives show up a lot, probably good if one has some experience from before.

Overall though the book doesn't assume a lot as I recall, and goes through the constructions from a fairly basic level and up.