DD needed 131 credits. She had not ONE credit going into college. She started at Calc 1, chemistry 1, had to take the dreaded English classes (TWO of them!). She just slugged through, went to study tables, took 16-17 credits per semester (as suggested by the department). She didn’t do internships or co-ops.
It can be done, but you have to really want to do it.
She wasn’t miserable in college at all. She has a boyfriend, she was on a varsity team, was in a sorority, in the engineering society, etc. She doesn’t play video games or watch much TV (football games on Sunday evenings) and is really organized.
My nephew was similar at a very different school, a large flagship. He didn’t do well in Calc 1 so had to repeat it, took Calc 2 in the summer and was back on track. Graduated in 4 years.