Where exactly does it say that we can only extend it 3 month before it gets expired? There is no such information anywhere. It only applies to students who enter a completely new institution or start completely different program from next semester (which is not my case since I am already actively pursuing my studies....). For SP extension it only says apply at least 30 days before the expiry date.
And my hospital test center (the one I did my medical exam) is 15 hours flight from Toronto, so something tells me that it's not that easy just to take my receipt there...Anyways I had already submitted my application. All I wanted to find out initially is if attaching just a receipt would be fine or not. Cause I assume they have all the information in their database anyways, so they can easily look up whatever they want