<p>Those count towards graduation but don’t exempt you out of anything (as opposed to in L&S where AP Chem gets you out of Chem 1A though most people choose to take Chem 1A anyway since college-level chem is so different).</p>
<p>I don’t think it really makes a difference though, because in CoC you’re not likely to have a lack of units 
As for 4 years - I’m shooting for a simultaneous degree in 3 years (6 semesters + 1 summer), so yes, it’s possible. Just be prepared to have a lot more work than anyone else and receive incredulous looks when people ask how many units you’re taking…</p>