Autocad and Max are different applications, aimed to fulfill different needs. Autocad is a program for drafting and architecture, and primarily uses vector graphics - lines, circles, arcs, etc. 3D Studio Max, on the other hand, is a full-featured modeling application, most often used for polygonal modeling. ("We can make anything out of a box," my 3D instructor began.)
When it comes to getting class credit, there's no way for us to know. Ask your teachers :) But if you're using Autocad, you're not going to be able to do as much as 3DS Max can. Autocad isn't meant for much beyond architecture.