Dear grandma,
Long time no see. How's it going? I hope grandpa is well now. I finished my final exams last week and got a very good grade. My English teacher said my listening was good ,and I am happy. But my Science teacher said that I was lazy, which isn't true. It's just that I found science really difficult! And I hope I can have a good vacation and visit you soon.
Best wishes!

Love, 
Li Li