Questions about Probability Modeling

Ryuk1990

I'm signed up for a probability modeling class geared towards engineering majors. I noticed that the prerequisite for it is Calc 3 (multivariable calc). What concepts from calc 3 should I expect to see?

Also, how hard is this class in terms of sheer difficulty of the topics? I'll have a big work load this coming semester (including 2 engineering labs) so I've been thinking about dropping it for now and saving it for another semester.