I'm writing this letter to inform u that I will not be able to continue the computer diploma course
from next month .
.... you have to say either;I will not be able to continue the diploma course
... ORI will not be able to attend the classes from next month
i'm Malsha Perera and my student ID is 3990.
You need to start the letter with these details. First introduce yourself and then tell the purpose of writing. Then give reasons for such decision. Finally tell them what you plan to do.