For your NOC 4011, if I remember correctly, you can have multiple jobs and piece them together to form a 1 year continuous experience.Yes, I'm on Post-ITA, but the NOC is still important because the documents I submit need to proof my claimed NOC, and at the Post-ITA stage, it's still possible to change NOCs. That's why I started a thread asking if I should switch NOCs.
Basically, if I claim NOC 4011, I have to scrape together some part-time hours (20 hours per week from August 2015 to May 2017) and full-time hours (30 hours per week from June 2017 to May 2018) to barely just get one continuous year of full-time work, and that's still hoping that my previous employer would write a reference letter that considers me employed for an uninterrupted amount of time between part- and full-time. There's also the added worry that IRCC won't consider my part-time hours because I got them during a period of full-time study, even though the job is literally the same as the one for my full-time hours.
However, if I claim NOC 4031 (Secondary School Teachers), I have 35 hours per week from August 2014 to July 2015, in addition to my 45 hours per week now at my current job that I started in September 2018. If I decline my current ITA and wait for the next one, I would have at least two years of experience, including one continuous year, to claim for NOC 4031.
The question I asked in my thread is whether I'll need to submit additional documents in order to claim NOC 4031, such as provincial licenses (or proof of eligibility) or TESL Canada certification. Do y'all happen to know or know people who know?
Also, the only scenario where IRCC won't consider your work experience gained during full-time study in Canada is when you apply under CEC program. That is, If you had worked during your full-time study in Canada, you can still use it provided that you apply under FSW. If that experience took place outside Canada, you don't even need to worry.
Regarding certificate for NOC 4031, I supposed it depends on where you worked. In Canada? And is registration required to teach in secondary school there? If yes to both questions, perhaps you should, since IRCC can reasonably question how you got the job when you did not have a proper registration in the country. On the other hand, there are plenty of countries where being a secondary school teacher does not require any type of certificate/license, and if that is your case you should be fine without one.