Students can earn credit and receive their High School Diploma through Delano Adult School. Students we serve are 18 years and older. High School Diploma classes are FREE of charge for all students who enroll. For students who are interested in a high school diploma, they should contact the office to enroll and schedule a counseling appointment. It is essential to provide official transcripts from the last school you attended or all schools you attended in order to determine the credits you need to graduate.