Email on owing to debt of gratitude

Send an email to one of your teachers expressing your gratitude for his encouragement before your examination. 

I am very sorry that I could not send email to you earlier. I am now a first-year student at Dhaka Medical College. The credit of my success goes to you. I would have never been here if you had not encouraged me before my examination. I always remember the support you extended in those days. I am really grateful to you. 

I sahll be very happy if you write a few words for me through email. Your words always inspire me.