I was/am on both extremes in school. My class participation was typically excellent, and I loved interesting conversation, but I was not always good about doing the work. This is especially the case when writing is involved (Academia prizes formal writing above all else, and won't accommodate writing disabilities the way it will other subjects. I have severe hang-ups when it comes to writing, so this has been a real problem). I'm also a pretty bad procrastinator, and I'm an atrocious perfectionist. I also have a home environment where it's difficult to work and I'm easily distracted. Put all this together and it's not uncommon for me to get a mixture of As and D/Fs.
I'm well behaved, but given how much I was bullied in middle and high school, I can't say I entirely trust my peers. I'm somewhat aloof as a result.
Anyway, I was doing very well after going back to college until this whole transgender realization thing hit. I've been on very shaky footing ever since.
On a side note, I really wish they taught you why you need to know math before attempting to drill it into your head. I hated rote mathematics, and put up as much resistance as I could. Now that I'm an adult, and math is actually useful, I wish I knew it better than I do. I'm fine with mathematical logic, but I suck at computation.