Need info about study permit extension!!!!!

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I need urgent help!!! I will be completing my course byAug 25 but my study permit expires by Aug 31. Since my course ends by aug 25 I will get the official letter from my college ;say by first week of September. When I met the international office in my college they gave me a solution to this and I found out couple of more.I want ur advice by telling me which option is best!!!!! *****note right now I am doing 4 courses in my final semester of 2year program 1.apply a bridge study permit(advice by my college) 2.drop a course and get a extension letter from college and apply for extension( advice by my friends) 3. Change my program to 3year which is just a extension of my 2year course and apply For extension(advice by my friends) Your help will be greatly appreciated... Thank you Varun