辭職信用字有冇問題

I prefer to be less formal in the beginning of the letter.

I am writing to submit my resignation from ABC Company as of June 1, 2008 for education reasons. (replace study reasons)

or your original text but mention the date and use education, not study reasons.

for all the support that I received (not have received)

having worked with your company (replace for)

On the whole, the letter is a very acceptable one.

大至上原文己可接受, 加減些少字使它更順. hope it's okay with you:
Dear Boss,

I hereby submitting (confirm in writing) my resignation from this Company because of studying reason.
I would like to express my sincere gratitude and thanks for all the supports that I have received in the past month (over the last one month), and for the enjoyable experience of having worked for your company.
I wish all of you a prosperous future.

Yours sincerely,

Mike Chung