GM cash back incentives -canada

Right now GM has a 4500 cash rebate (non-stackable) or 0% financing. They also have $1500 fall bonus (which my dealer says I can't combine
with the $4500. However, he says that I can combine a $1000 new grad incentive (just graduated from school) and a $500 24 test drive incentive.
I guess my question is, has anyone had any experience with this? Can I stack the 1000 school + the 500 test drive with the $4500 cash rebate? Can I stack all 4? Can I not stack anything with the $4500? Please let me know your experience. Thanks,
Rob
PS: This is for a Pontiac Sunfire in Ontario Canada if it makes a difffence.
GM cash back incentives -canada
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