The tests are somewhat difficult, and with the good agencies, it can be very competitive.
I have temped off and on since 2003, and I generally work pretty steadily when i want it, in the $20+ per hour range, but I type well over 95wpm with close to 100% accuracy, and I average around a 97% score on Word, PowerPoint, Excel, and Access. I also have experience using Lotus, Adobe, Oracle, Visio, FrontPage, and have been a personal assistant to a corporate president as well as an exec asst. to several other high-level officials.
You don't HAVE to have the above qualifications to work, but realistically, if you cannot type above 60wpm with considerable accuracy and you can't score at least 75% or better on the Microsoft Office tests, then you're looking at $12-$14/hr. reception/mailroom gigs, and that's about it. The good money is in executive admin and project management work, and you need considerable computer skills to get those jobs.
However, some of the better agencies DO offer training for those who want it, so don't be discouraged...these are easily acquired skills!
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