Anonymous

No, because you can't start classes when a semester is already 2/4 over, and some quarters are only 8 or 10 12 weeks long, so the quarter would be ENDING.

Anonymous

You can't join a class if it's already 3 out of 4 months in. There is a certain add/drop period that usually lasts about a week or two which locks all students into the class or out of the class.