In January, 2019, The National Association of Interpreters in Education developed, Professional Guidelines for Interpreting in Educational Settings. I thought you might be interested in reading what they have to say. NAIE is a relatively new national organization focused on interpreters who work in the field of educational interpreting. I would suggest you go to their website and view the information they have there. The fee for joining NAIE is $60 a year, but they have many resources and even webinars that are free to NAIE members.
http://naiedu.org/guidelines/
http://naiedu.org/guidelines/