I found this brochure online that may be able to help you and your grandson. It outlines the GED program in Hawaii (as of November 2007), and includes a listing (on page 2) of related organizations and their contact information:

http://doe.k12.hi.us/communityschools/GEDBrochure%2011%2007%20w%20TM.pdf

You might also review Education.com's GED information center, for general insight (not specific to Hawaii), that could be helpful as your grandson prepares for the test:
http://www.education.com/topic/ged-and-college/

Lastly, you might also contact high schools in your area to see if they have or know of any programs that would help your grandson finish school and get his diploma. You can use SchoolFinder to find the contact information for schools in Hawaii:
http://www.education.com/schoolfinder/

I hope this information is helpful to you.

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