It is very hard for me to list what I think is the most important thing for a student to learn when it comes to computer learning. I went to a school where you didn’t take classes that focused any attention on computer use or internet use. We were just expected to learn these things on our own.

I would have to put them is the following order:
Word (You will use this the most in your life.)
Power Point (Standard for any presentation.)
Instructional Games
Drill & Practice Programs
Spreadsheets (Excel)

I don’t think that you should have to know Excel or Power Point until High School level. As for the other programs listed I believe these are the most important software’s. I am willing to admit this might be because I am lacking Computer Education myself