What is the percent adjectives that my Canadian student visa extension will be granted?

I am applying for a Canadian student visa extension and change of status (from secondary school student to university student). I hold a student visa now but it expires in August. I am an American citizen, 17 years old. I hold acceptance to the University of Toronto where I want to go. My relatives and I do not have any criminal offences, and no one have been rejected for a visa in the past. My ethnic group will not be living with me when I am studying (they will be living in the States). My family is inclined and able to pay for my education and room/board while within Canada, and we have good proof of funds. We currently reside in Toronto.

Based on that information, what is the percent fate that my student visa extension will be granted?

I put some details about myself but if you need more to answer the question, please ask. If within is something else I should know about this type of visa or immigration services, please let me know!

Thanks in credit for your answers. :)
Answers:   
I would say a very high percent. I would not want to vote 100% - but really, you have all the right background, and the reality that you have previously been approved for a vias is also good.

I guess you need to stop second guessing yourself, and just apply.

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