"You can make excuses, or you can make it happen."
I have found that A students will always "make it happen," whether it be coming to class with a just-sprained ankle to be able to turn in a paper on time, or emailing three weeks in advance because their doctor's appointment might right two minutes late. They communicate to inform and cover their bases. They comprehend the policies.
I didn't understand attendance policies for jobs until I worked a minimum wage one. One day, we lost a lot of revenue because a fellow employee who was scheduled to work failed to show up, and gave us no notice. I had to work two different stations, and deal with a screaming boss.
I have found that C students "make excuses." They are always the victim. It is always the fault of someone else. There is no personal accountability or responsibility.
I really wish this thought had come to me when I had to deal with yet another attendance excuse. A students "make it happen." I'm tired of the excuses. You're here or you're not. You know the material, or you don't.