Are taking summer courses useful in admissions?

<p>What if you take a summer course that doesn't count for credit in your school, but it allows you to skip a level of .. say.. math. And it covers a year of schooling, it's just not considered 'compatible' enough to the district to give credit on the school transcript. Could you put that on your college apps under 'courses taken for credit outside of school' or not... could you indicate it at all?</p>