Test for prospective employees? OT

Hi there. I'm wondering if any of you can help me? I have been delegated with the task of formulating a test of sorts for prospective ICT technicians (2), and though the school now runs some sort of testing itself (though I don't know what they do yet) are there any suggestions as to what I can do? Have any of you been to an interview in a school for an ICT position, and if so, what did you get "tested" on? Are there any web sites that give templates for tests etc? Just wondering. Thanks, Paul