This "Worry Tree" is a poster I would love to hang in my classroom. It is a resource I think students could refer to, when needed, to help them regulate their emotions and deal with their "problems" in an effective way. Eventually, they will be able to follow this process on their own, and develop their emotional competence - which is an important skill that underlies positive mental health (Reinke et al., 2011).
Dyslexia Card for Teachers - from Dyslexic Advantage. Actually, 1 in 5 students are dyslexic, but other than that, this would be a good card to give to your child's teachers. Maybe have something on the other side about your child specifically.
Classroom Rules ~ Is also useful to use the summer before your child starts Pre-K or Kindergarten so they will become familiar with what will be expected in school :) I am doing this over the summer with my twins and also with my son who will be going into 1st grade to help keep the structure that he has learned at school during kindergarten