Special Education Teacher
Think about your own experience as a student and how you feel at various points of the year. In my experience working in elementary school, the month before Spring Break! The weather starts getting nicer and it's the 2/3 point in the school year when everyone gets antsy. The last month can also be challenging because it is incredibly busy for everyone as you prepare for the end of year activities and trying to fit it all in. Many teachers also starting thinking about how to make changes and prepare for the next school year already.
As per my previous experience, the most difficult phase that I faced was in the month of October to December, since I was working for a Technical Support firm where the calls inflow will go high enough during that time.