Which courses do you actually need?

Prerequisites are written out one program at a time, which makes it easy to answer "what does this program need" and impossible to answer "I dropped calculus — what can I still apply to". These read it the other way, across all 1,582 programs whose prerequisites name a course.

The first number is how many programs require the course outright — it is forced into your admission average whether or not it is one of your best six. The number after the + is how many more accept it as one of several courses you could choose from, where a different course satisfies the same requirement.

Courses required by fewer than 12 programs are left out — below that, “what else is open to you” is everything, and the page says nothing. Each program’s own prerequisite list, in the university’s wording, is on its own page.