I wonder about this due to my child being a left-hander and seemingly struggling with her writing, despite working at expected levels elsewhere.
One of the problems that I noticed during a recent parent participation session (and I mentioned this to the teacher, as she hadn't noticed), was the difficulties for the left-hander in using the handheld white board + felt pens to practice writing in class. As soon as DD moves across the board while writing a word, her sleeve then smudges her work as she moves across. She then attempts to correct this, while the class move on to the next thing, and so she easily loses track of what is going on. The teacher hadn't noticed that this was happening, despite the small group number.
Do left-handers get any help to overcome such difficulties in your experience?