There was a lot in my plate that time. i was also working part-time at the same time.
There was a lot in my plate that time and I was also working part-time then. I am so confused now
This won't be accepted as a reason for dropping down to part time status. If you had too much on your plate, you should have stopped working and focused on your studies. Again, one of the requirements for getting a PGWP approved is that you remain a full time student throughout your studies (apart from the last semester/term). You don't meet this requirement. That's the black and white answer here - you need to be expecting a PGWP refusal.
Note that you are only allowed to work part time off campus if you are studying full time. If you dropped down to part time status, you were required to stop working off campus. If you dropped down to part time status but continued working off campus - this will be classified as illegal work and a violation of the terms of your study permit.