Howdy,
Project with title Photoshop just appeared on my screen and i red your description "Hello! I need someone to do a simple photoshop job of my grades......"
I am qualified artist with skills including Photoshop, Illustrator, Photoshop Design, Graphic Design and Photo Editing.
Seems like your are on the right place and i am the right person offering services for this, i have recently done similar project which you can check on this link:
https://www.freelancer.com/u/CustomIDEAS
Do you have any specific required dimensions ?