yeah, I don't know that you'll be granted a visit extension once you are in Canada. When posters say 'you'll be able to extend your visit' they are usually talking about cases when someone is married to or in a common-law relationship with a Canadian citizen or PR. That's not the case for you. It might be ok, but it might not.
You might want to talk to an immigration consultant or lawyer who has experience with all kinds of immigration classes and cases - the people on this forum are not all overly familiar with work, study or visit visas outside the context of family class immigration.
For example, I'm not familiar with the process, but I don't think that you can 'get a work permit' by just applying for jobs. You may be able to get a study permit to attend a canadian college or university, but you would have to actually attend the college in order to maintain its validity. You can't get accepted to a canadian school for the purposes of the study visa, and then not actually attend (as far as I know, anyways).
