If you’d like to congratulate someone for graduating from high school, here is a sample congratulations letter for high school graduation.
I have never been so proud of anybody for going through school like you did. Hence, congrats that the journey is finally over and good luck on the next one. I went through school before too and I know it is no easy task as a lot of hard subjects will be along the way. It’s great that you passed all of that and it shows how smart you are.
I want you to cherish the feeling of finally being able to graduate school. Don’t apply for a job right away. You deserve a break so relax for a little bit before entering the corporate world.