Machinist wants to go back to Engineering School

I'm a university drop-out (chem engineering 5 years ago) working as a CNC machinist. I am interested in learning CAD and CAM softwares to move up the line at my company. However, I'm not sure which ones to pick. I go to night school at a community college retouching my basics like calculus, physics and chem. Can someone please give me some advice on which CAD and CAM combination would be most useful for me in my current situation and the future?