Can i enter college the summer after i graduate?

Generally, they prefer you don't do that and I really suggest you don't either. You could take the summer courses they are offering you but summer courses are harder than regular courses. They are condensing an entire semester into a few weeks and you REALLY have to be on top of your game. I suggest that you wait it out until the Fall to get a real feel for cles. You could always take summer courses the summer after Freshman year.