FWIW, back in the day, I just barely got through college, mostly because I had way too much fun. And around the time that grades were sent home (or academic probation notices) I would run to the mailbox everyday to be sure my mom never saw them. I did learn some excellent life skills in college! And I have had a highly successful career, and when I went back to grad school I did very well.
And it all comes back around, one of mine really struggled as an undergrad (and hid grades) and now is excelling in grad school.