High School 21+

Earn your diploma at RTC

The Adult High School Diploma (HS 21+) is an opportunity for adults aged 21 and over to complete a Washington State High School Diploma.

Adults work with an RTC instructor to demonstrate competencies in reading, writing and math contextualized in science, history, government, occupational studies, and digital literacy. The program combines current coursework with previous learning and experience.

Consider, for example:

  • What high school credits do you already have?
  • Do you have work, training, or military experience?
  • Do you have any certifications (such as CPR, First Aid, Food Handlers' Card, Forklift, etc)
  • Have you taken any GED tests or college classes?

To get started on your diploma today, register for an ABE Orientation on campus, or visit any of our off-campus locations.


Debbie Chou

Basic Studies Assistant 1

Basic Studies


(425) 235-2391