Native level of English, papers to prove a C2 level of Proficiency

My highest education completed is an associate's degree in liberal arts at the University of Hawaii Maui College. I scored the highest amount on the placement writing exam. I have taken courses: English Composition, College Reading, Writing Intensified Hawaiian History, Writing Intensified Oral Communication, Screenwriting, and others. I have taken multiple AP English courses in High School. My cumulative GPA in High School and College was 3.8. As stated in the headline I have credentials to show I have C2 English Proficiency. I can also teach math subjects.