Want to get your Diploma? (It was called GED, now it is the HiSET). The CAI Adult Learning Center offers free High School Equivalency Prep Classes. The next Waitlist Registration dates are scheduled for Thursday, May 11 and Tuesday, June 27 at 10 a.m., 3 Washington Square, 3rd floor in Haverhill, MA. Please arrive on time and plan to stay until Noon. Please do not bring children. Registration is for classes that begin in September.