and like is there any time frame like in how many months i should apply for the pgwp ? if also get extra pgwp by opting for 1+1 courses like the post is about .
Regarding the time frame:
Applicants must apply for a post-graduation work permit (PGWP) within 180 days of obtaining written confirmation, such as an official letter or transcript, from the designated learning institution (DLI) indicating that they have met the requirements for completing their program of study.
Calculation of the 180 days begins the day the student’s final marks are issued or the day formal written notification of program completion is received, whichever comes first. The onus is on the applicant to provide proof of the date the transcript is received. Officers may also confirm this date with the DLI.
Applicants may apply for a PGWP from within Canada if
their study permit is still valid
they have a valid visitor record because they changed their status to visitor status before their study permit expired, while waiting for their notice of graduation from their institution, or simply to remain in Canada. However, they would not be eligible to work while waiting for a decision on their PGWP application as per paragraph R186(w)
they are on implied status, meaning they submitted an application to extend or change their status to visitor or student before the expiry date of their study permit and no decision has been made.
Source:
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/temporary-residents/study-permits/post-graduation-work-permit-program/permit.html
Regarding the other question you have to start a new course once you finish your current and on its completion apply for a PGWP.