http://www.cic.gc.ca/english/resources/manuals/bulletins/2010/ob194.asp
"Full‑time versus part‑time studies in the last session of study
If a student meets all the eligibility requirements, with the exception of full‑time status, but is in their last session, they will still be considered to be eligible for this program. For example, at an institution, a student may be required to be enrolled in at least four classes to be considered to have full‑time status. However, a student in the last session of a program of study needs to take only two additional classes in order to receive a Canadian educational credential from that institution. That student will still be eligible to apply for a work permit under this program."
Toronto cn said:
i have almost finished my 2 year diploma as a full time student but my last semester has less course load(30% of total) 60% or more is considered full time. International student councilor told me i will get 3 year coz last term or semester doesnt matter. I want opinions of experienced members to reflect upon my case. i will be very thankful.