[Nyororin]

For the actual work? Not much at all.
To get the degree? Quite a lot.

In the end, you just need to know and understand the basic concepts. You can forget most of the actual formulae, etc. But you will need to cover them and make it through the classes in order to get the credit you need for graduation. Specifically *what* will change based on exactly what it is you`re aiming for.