Hello. Does having more significantly more credits than the amount required to graduate, meaning I have taken many extra classes, improve my chances at college admission? What do you think?
Depends on the extra classes you plan on taking.
If they were challenging and you did well in them.
Just extra classes? No. If you took extra classes in some particular area because you have a long-term interest that you have demonstrated in a variety of ways, then perhaps. But just more units than everyone else? No.