Well I started in HS, I was a CNA, Had two netware servers running on the school network, helped out as an admin, was given microsoft developer package my junior year of HS. Senior year became co-chair of the county ardware recycling program. Took college level class for Network operations.
In college I became Chief engineer of schools radio station, in Florida. So was doing alot of audio engineering and streaming audio stuff. And also had a job as a network Level III tech for the schools IT department. (This was while I was going to school for Comp Sci. I have since changed majors. Programming for a Job is boring)
So I guess I have been working with networks for over 8 years and I'm only 23. And the thing that got me started was while I was still living in NY, my Soph year of HS I was asked to teach a Basic programming class at the community college, and the labs network sucked so after fixing that I was hooked.
The MS tests are rather easy if you have played around with the Software on alot of diffrent setups..
Most peoples problems are that they have not used enough of the features or delt with the problems that MS wants you to know about