I'm going to preface this by saying that most skills can't be obtained within that short of a time frame... You may learn how to "do" it, but that doesn't mean you will be effective at it. Moving on to the more helpful part.
After 6 years of being on the fab/mechanical team, I would recommend:
- learning how to properly, and effectively use a hand drill. This helps tremendously when building/making anything, especially prototypes.
- The difference between to tight, and to loose, when referring to nuts & bolts (this applies to parts and fitting as well.)
- How to follow the path of a contour of a design when using the bandsaw.
- (personal pet peeve of mine...) Put tools back where they belong when you are finished with them!!! (not really a skill though).
- Learning the sounds the machines make when they run correctly, and more important, when they crash, fail, or overall mess up. You will almost always get some audible sound a few seconds to a second, before the machine decides to commit suicide.
- develop/practice using both hands when creating. Don't stick to just your dominate side being able to switch between hands makes working on any project easier.
These are the few things I would recommend you work on, as well as they other suggestions mentioned above.