Nothing in life can take away the lessons you have learned while walking along the road to success. Congratulations on graduating dear best friend.
My warm and thoughtful words cannot compare to the hardship you have overcome over the years of being a high school student. Congratulations and Happy Graduation!
Finally, you have reached your goal. Congratulations! Your hard work is the main reason for this big achievement. We are proud of your brilliant success. Best of luck for your future friend.
Congratulations on your high school graduation. This is not the end. There is a long way to go, and I am sure you will succeed in every phase of your life. Best wishes to you.