A few questions - Canadian student applying to US

I was wondering:

  1. How long is too long for your additional information? I wanted to split it into three sections regarding my research, my environmental work, and personal circumstances at about 200 words each.
  2. What’s the difference between enriched, honours, and accelerated? We don’t have “AP courses”, but I’m in a really advanced/enriched program (that my guidance counsellor explained in the letter), and I’m not sure what to put for the course.
  3. At the end of the common app essay, does there have to be a reflection? I talked about a very specific (and kind of sad, my teacher cried??) moment in my life, and I sprinkled details about myself throughout the essay, and I felt it would take away from the essay if I suddenly had a short paragraph of reflection.

Thank you so much! I really appreciate it.