What's the difference between normal and late APs?

Test Preparation AP Test Preparation
1

<p>Yes, I know they're later, but is there any major difference? I'm taking Language on the 18th.</p>

2

<p>Different curve. Different questions. Difficulty should be similar; any difference in difficulty will be reflected in the curve.</p>

<p>Basically, the late test and normal test should be interchangeable (i.e. CB can theoretically choose either one to be given on either date) because AP exams are both reliable and valid.</p>