Hey there!
I hope this letter finds you well! I wanted to let you know about my performance in the last term examination. I'm really proud to say that I did really well! I worked really hard to prepare for the exams and it paid off. I got good grades in all my subjects and I'm really happy with my results.
I'm sure you're doing great in your exams too. Let me know how it went for you!
Take care,
[Your Name]