Well. . . I think it depends on many factors.
My oldest, now 20, was so difficult in school. We had to stay on him like white on rice! BUT he was so easy to parent in other ways. If he knew I was ready to lose it, he would back down and start sucking up and making jokes. I'm a smart woman, I know he was sucking up! Point being, he knew NOT to push the issue.
Our 16 year old daughter is the opposite. She is focused and driven when in comes to school and academics. I don't check her grades or her assignments, because I know she's on top of it. But if there is an issue, she'll push it. Don't get me wrong, she is a good girl. I trust her and her friends. But she will find the loophole to any and every rule and argument. She came out that way! Even when she was little she always pushed the envelope just a little bit more!
Each kid needs parented differently. Each kid has their own unique personalities. You can love and discipline both kids equally but differently!