Dear Rahul,
I hope this letter finds you in good health and high spirits. I am writing this letter to congratulate you on your exceptional performance in your class VII annual examination. I was thrilled to hear that you came first in the exam and received the well-deserved prize.
Your achievement is a testament to your hard work, dedication, and perseverance. I am proud of you for setting such a high standard for yourself and achieving it with flying colors. Your success has inspired me to work harder and strive for excellence in my academic pursuits.
I am sure your parents, teachers, and schoolmates are also proud of you and your achievement. Keep up the good work and continue to excel in your studies.
Once again, congratulations on your outstanding performance. Wishing you all the best for your future endeavors.
Best regards,
[Your Name]