One possible version:
Dear Sir,
I’m a student of Senior 1. At the beginning of this term, my parents and teachers asked me to board in the school. They say it will be very convenient for me to ask questions whenever and wherever. Besides, they think boarding will make it possible to make full use of my night time, and that I also develop the ability to look after myself.
However, I have my own thoughts. Staying at home in the evening, I will have more time to work at my lessons. At the same time, I can learn what I think I’m not good at. I really don’t know what to do. Please give me your advice!
Yours,
Li Ming
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