but I already have 1 year of skilled work experience with noc b. I just added the 4 months previous exp from 2016 to make it 2 years work experience in Canada to get a higher score for my crs.As long as your points wont come down below ITA mark with out considering that 4 months experience you will be fine. With out reference letter its hard for any VO to believe that you actually did a skilled job. But how come did you enrolled in school while you are working. Is that experience gained on study permit? I am not an expert but this is just from my opinion.