I handed in assignments I didn’t do as if they were my own and it paid off.

I’m 100% guilty of doing nothing in my way too easy university degree. I’m a communications major and there’s been multiple times where I’ve missed assignments and instead of asking for an extension or doing it late, I just don’t do it and tell them I submitted it. And I get good marks. I don’t know how they don’t notice. They are literally just copy and pasted from some random pdfs online, or even some actual assignments I’d done for the same course in a different class (a lot of the teachers teach the same courses and literal classes back to back just with different students). I don’t understand. I’m 4th year and I still get good grades even though I don’t bother to do the work. I’ve pulled a 3.7 GPA and will probably get over a 3.9 in my last year. I’m so desperate to leave this school I’m willing to do anything to get out without retaking classes or losing my scholarship.