To be honest there is very little additional training for a paraprofessinal, even after the law of being highly qualified came about.
You either pass a state approved skills test or have a asssociate degree.
I wished I would have had more training as a Paraprofessional.
But as far as my Special Education with Alma College, my experience in the classroom as a student, field placements and prior knowledge of the way a classroom works helped me understand the students comprehension levels at a deeper level, specific teaching techniques, common core state standards and the purpose for specific class management techniques.
Therefore, in my last two years as a paraprofessional, I feel my added experiences has helped me be successfull with working with students individual needs. It has also allowed me to join my experinces in a usefull manner to the classroom as I began my journey as a student teacher and subsitute teacher this fall.