The pre-reqs for the accompanying class include both single and multi-variable Calculus, as well as differential equations.

http://ocw.mit.edu/courses/mathematics/18-01-single-variable...

http://ocw.mit.edu/courses/mathematics/18-02-multivariable-c...

http://ocw.mit.edu/courses/mathematics/18-03-differential-eq...

It's a long road, but a very rewarding one. Good luck.