I have a question about graduate schools and undergraduate GPA?

Grad schools expect you to have a minimum GPA of 3.0 to apply, and most expect a 3.5 or higher. You won't have the buffer of 'easier' courses (although you can't have taken every intro course) but you'll also hopefully not fail a bunch of cles your first year like many incoming students. Expect to be held to the same standard as everyone else.