Dear Mark,
The winter vacation is on its arrival.I think it would be best that you could arrange your time during the holidays so that you could effectively fulfill the following tasks.
You must use this time to finish your homework and revise all that you have learnt during the previous semester,so to upkeep your academics.
In addition to securing your grades,you should also maintain good health.One of the important things to do is doing sports regularly so as to burn your calories efficiently and put your body in consistent physical training.
Lastly,you should join some social activities,earn some experience in socializing,and build more self-esteem.
I wish you all the best during your winter vacation.
Yours sincerely,
Lee Wah
(126 words)