I finished college in Canada on June 2014, then I have been working in college lab as "Graduate Student Employment"(from my contract) since then.
If you are not a graduate student, then how do you have graduate student employment? This is confusing and could cause you problems. You need to check with the college's dept of human resources to see how they have you classified. If CIC contacts them and is told that you are a graduate student employee, your experience will not be counted.
I asked my NOC classification to supervisor, then he told me mine is "NOC 4012 College Laboratory Assistant"
The NOC is a strange one, it seems appropriate for a lot of college/university jobs, but you'll see under Employment requirements that "Enrollment in a university or college program is required." CIC has been going back and forth about whether or not they will accept this NOC as non-student employment, but if you can find a different NOC that fits, you'd be better off. And your letter of employment will have to make it very clear that you are strictly a worker, not a student.