Can I cancel my study permit extension application after applying for PGWP?

[itspayel]

My study permit was valid till 30th April and my study was also supposed to get completed in April. However, I had the apprehension that I might not get my transcript and completion letter before my study permit expires. Hence I applied for a study permit extension which is still in progress. Meanwhile, I got both the transcript and completion letter before my original study permit expiration and I applied for PGWP also before 30th April. Now I have two pending applications - one study permit extension application and one PGWP application. Now I don't want any study permit, need only the work permit. What should I do now? Cancel the study permit extension application. Has anyone been in this situation before? Also in this situation, can I start working full-time?