What kind of job are you going for?
I'd put the education history below the work history, and also split it between the professional qualifications (which I'm guessing the security college stuff is) and the school education.
You don't need the words Curriculum Vitae at the top in size 36 font, they already know what it is.
Put your name and contact details in the header or footer so it appears on every page.
You don't need to put your references on there, if you want to put something, you can put "references available on request" or similar, but even that isn't really needed.
Under the Key Skills section, I'd put each "skill" under a separate bullet point rather than grouping them, and lose the line spacing between the bullets. Do you have a driving licence? Could always be worth listing that as well.
Change the "Escalating calls" bullet on the last job entry to match the rest of the formatting.
Tidy up the Job title/Company/Dates for the work history, and put the job title first as it's the most important.
I'd also maybe list current role separately from the previous roles
