I graduated as a Valedictorian at  my high school
Nice, you must have been the student with the highest ranking GPA among your graduating class.
Of course yes. I am the best student in the school. I put a lot of hard work to my studies 
The term Valedictorian derives from the Latin "vale dicere" which means "to say farewell".
Hmmm. I love the program in our school. I have been looking forward to mine two years earlier
Nice!  In Australia the title Valedictorian is sometimes awarded to a member of the class that contributed a lot, and not necessarily the best academic.
I see. But what kind of contribution could that be?
Some sort of contribution to the school.  Seems as though one way could be involving donations.