A sibling comment mentions linear algebra. Vectors are introduced early on, and the chapter on tensor introduces matrices (eg second rank tensors). Multi variable calculus? I can't find where partial derivatives enter, but there's a chapter on vector calculus (to get ready for Maxwell). Really, it's all in there with no prior knowledge needed.
It's certainly a lot easier if you've seen the material before and read FLP as a second perspective. Hence why so many of the attendees were grad students and faculty. What it lacks as a teaching aide is the mind numbing exercises that all physics students do in their first year to practice using the mathematics. There's a reason the "University physics" books are doorstops.
Would that include books like Griffiths' Introduction to Electrodynamics and Purcell & Morin's Electricity and Magnetism? Also interested in what people would use for Biology.