D_J
I'm not really familiar with the KCSE qualifications, but you seem to be pretty sure that the grades are less than the high school equivalent required.
The Diploma in IT may well be considered a vocational diploma and therefore will not count toward the educational requirement. So you may not qualify through the education route and that would mean you MUST qualify through work experience.
In order to qualify for work experience you have to have 2 years experience in a qualifying occupation. Those occupations are those that generally require a Bachelors degree to perform the role. The title Computer Technician sounds like someone who works in the support of PCs perhaps in a help desk type role. That sort of role would probably NOT be considered a qualifying occupation - so you need to be realistic about how your occupation will be rated. If you would like to explain your occupation with some detail here we could probably help you assess whether the role will qualify you or not.
This link shows the occupations similar to computer technician. Some of these roles are not qualifying roles, some are.
http://www.onetonline.org/find/quick?s=Computer+technician
