<p>I believe you can apply 12 AP credits, which is exactly one year (4 credits x 3 quarters). But if you’re taking more than 4 classes in a quarter in order to accelerate your graduation, they up your tuition. So presumably you’d end up paying the same amount of money in the end. <a href=“http://www.northwestern.edu/sfs/evugrad/tuition.html#excess[/url]”>http://www.northwestern.edu/sfs/evugrad/tuition.html#excess</a></p>