可否幫我check 文法, (不要電腦check ) 十分謝謝!

Buddy, your sentences are pretty well. There are only few mistakes you need to revise:

the second row:
reach ---> has reached, universities --->[the] universities

the third row:
maybe or may be is a informal speech. you had better revise it as...
[probably my grades are not high/good enough, so....]

the fifth row:
help is a noun. it is not necessary to use -ing form. I then revise it ...
[thank you for your kindly help...]
and ...(being a part of the programme) means 成為課程syllabus既一部份, so you should re-write it: ...[being one of the students of the programme] or [being a student of the programme.]

Here are the changes:

I am glad that you are willing to help,
my A-level results have reached the mininum requirements of the univesities in Hong Kong.
However, may be it is just not good enough, so they refused to take a glance at my portfolio.
They had not even granted me for an interview.
Thanks for your kind help again but I think I have very little chances of being a part of the programme.

i am glad that you are willing to help
my A-level result do satisfy the minimum requirement set by the University of Hong Kong but it is just not good enough for the University to consider my application or to offer me an interview
Thanks again for your kind help but i think i haven't a good chance to be eligible for an enrollment of that programme.

I am glad that you are willing to help. In my A-level examination, I have attained the minimum requirement for entering universities in Hong Kong.

However, may be my qualification is not high enough, the universities refused to take a glance at my portfolio and I have not been granted for an interview

Thanks again for your kindness in helping me on this matter but I think I should have very little chance of being a part of the programme.

I try to correct as little as possible.

I am glad that you are willing to help, my A-level result reach[es] the minimum requirements of [the] universities in HK, but [maybe] it is just not high enough, so they refuse[d] to take a glance at my portfolio, they [did] not [grant] me an interview [offer].
Thanks for your kind [help] again but I think I [don't have much] chance [on] being a [student] of the programme.

OK VERY GOOD

My a-level result HAS REACHED... is better

in the last sentence you say

<i>

YOU WILL NOT BECOME A PROGRAMME, WILL YOU?

YOU SHOULD SAY:

I THINK I HAVE VERY LITTLE CHANCE OF ENROLLING IN THE PROGRAMME</i>