Since you study permit has expired, you don't status in Canada. You need to submit an application for both restoration of status and pgwp. Also, you must make sure that this is within 180days of your graduation.
You may also call IRCC for an advice.
You can check this trend whether it would help your brother.
https://www.canadavisa.com/canada-immigration-discussion-board/threads/hepatitis-b-and-canada-immigration.44687/
I will suggest that you submit your online application while waiting for AOR. Once you get AOR, you can send it to CIC using the web form. Otherwise, you might lose your status in Canada. It is required that you submit an application for a new work or study permit before the current one...
Is your work permit expiring within 4 month? I was told one can't apply for BOWP if your current work permit is still valid for more than 4months. How factual is this?
Below is my timeline
BC PNP Entry Level - NOC 6513
ITA - Aug 22
Application submitted - Aug 30
Additional document request - Oct 10
Document submitted - Oct 19
Nomination - Oct 23