How can a student build credit so no co-signer is needed?

He is definitely considering going to CC, but he has already been dually enrolled there for a few semesters during high school. He is running out of classes to take there that will actually transfer to the college he is looking at. He feels like getting his AA is a waste of time because the additional classes the CC wants him to take won’t transfer for his major (mech engr). His test scores aren’t great (ADHD, reading learning disability, disgraphia). ACT 22 and GPA 3.4 unweighted. So he isn’t going to get great scholarships.

His preference is to go to Cedarville as a freshman with advanced standing. He can either finish in 3 years then or, if he struggles at all with the heavy courseload, he can spread fewer credits over 4 years. Net Price Calculator is predicting COA as $21,674. That is a crazy amount of money to me, but it is one of the cheaper schools that I have run a NPC for.

Second option is to stay at CC to finish the rest of the classes he could take that would transfer and then transfer to CU. State Schools Engr programs are practically impossible to get into here…