In my Work Experience section, I only put in my current job, since it would be the only eligible work experience for immigration. In my personal history, I put in the internship I had after the first year, and my other Canadian work experience which I had on my off-campus work permit and implied status until I received my post-graduate work permit. Should I mention that in my explanation letter, i.e. "I did not include my internship and previous Canadian experience because the internship was during the course of my studies and the other work experience was on off-campus work permit & implied status"?