Follow the Canadian Oxford Dictionary, which is the authority for CP spelling.
- centre (not center, unless part of a proper name, usually a U.S. organization) in past tense is spelled centred
- per cent (two words, not percent or % in text)
- focused, focusing (not focussed, focussing)
- program (not programme)
- university (do not cap "U" when word stands alone)
- advisor (not adviser)