Check the letter in informal style, please
Hi Tom!
How are you? I'm glad that your exams are over. How did you do?
You didn't study much, so I think don't think your grades will be very good.
I'd love to go camping with you this summer. Every day I sit at home, so it'd be great if we could go together. Let me know where and when you plan on going. This summer I'm going to my grandmother's, so I need to know when you plan on going camping.
I've never been camping before, but I can ask my parents to buy me anything I'll need.
Also how many people will be going? Would it be okay if I invite my friend Bob?
Talk to you soon!
Lots of love,
Paula