On the common app, it asks whether or not I have taken any courses at a college or university. Doe taking dual credit classes at my school count as that?
No, that question is referring specifically to courses taken at a certain college. For example, you might have done some classes in your junior or senior year at a nearby community college. Dual-credit classes will not go on your Common App; those will show on your transcript. Your transcript will be sent to colleges after you apply with Common App. (I used Common App myself). Hope this helps!
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So would summer courses at a university count?