There are some colleges and universities that award honors at the graduate level, however, they are rare. Thus, other than that, you can just call it excellent work.
Many universties award a degree for exceptionally high quality work which is known as 'Cum Laude' which means 'With praise'
James Ruse High School
Bolingbrook High School
The motto of DeWitt Clinton High School is 'Sine Labore Nihil'.
Unley High School's motto is 'The Utmost For The Highest'.
There is a high school diploma which you are awarded after successful completion of four years of study in the required courses. There is also something called a "Certificate of Completion", this merely indicates that you attended a four-year high school and its courses. It does not state that you were earned enough credits to be awarded a diploma. There is a big difference between the two. After leaving high school if you did not earn your diploma, you can study and take a test to achieve your General Educational Development (GED) diploma. The GED is equal to a high school diploma.
Winmalee High School's motto is 'Strive to achieve'.
Formby High School's motto is 'Determined to achieve'.
The motto of Hollywood High School is 'Achieve The Honorable'.
The motto of Hutt Valley High School is 'To the highest'.
Mount Pleasnt High School
Calabar High School's motto is 'The Utmost for the Highest'.
Applecross Senior High School's motto is 'Achieve'.