I was a good little boy and a good student. I've never been arrested.

I was a good student, but I was the biggest procrastinator.

I was a good student, but I didn't like school.

So you weren't a good student.

I wasn't a very good student. I prefer to learn by experience.

I was a good student when I was a kid, and I did everything I was supposed to do, and I got A's.