Can u please advice anyone in this group has gone through similar situation?
I'm not sure about this particular thread, but there are a lot of posts about people getting refused for being part-time (and getting approved during reconsideration).
Best bet is to get a (good) lawyer, explain you situation as best as you can and do as the lawyer suggest.
If you have emails from your school (if you were dropped from a course) or medical bills or any other supporting documents, attach them in the explanation letter.
Search the forum for pgwp refusal due to part-time and you will find a lot of posts.
All the best! I hope you get it!