除左p.chan同joseph li之外,補英文邊個好?

First, to rebuild your confidence, you can start enhancing your competitiveness RIGHT NOW! IN THIS SUMMER! There are many ways, actually, I would elaborate to you one by one (:

1) READ MORE ENGLISH BOOKS
You said you're not good at english. you know? Attending tutorial classes for languages are just USELESS. The only way to improve your english is to read more books.
I could introduce you a few books if you like:
Tuesdays ith morie --> this might seem abit boring to you, but well...you should start from the classics. This is the basic.
Alex Rider series --> some kind of an adventure series. I personally think this is exciting enough for secondary one level.
Chicken Soup For the Soul --> This book consists of many heart-touching stories, which may be the motion for you to work hard.

2) WATCH MORE ENGLISH TV
If you dont wanna wate a penny on tutorial classes, simply by watching british or american cartoons or TV channels, you can improve your spoken english! This WORKS!!! I do that when I was young.

3) USE ENGLISH AS YOUR LANGUAGE WRITTEN
Whenever you send email to your friends, or go on to facebook, or text your friends, use english! This would help to improve your english skills! this is th best and easiest way to improve your english!

If you still do not have much confidence in your english, why not try tutorial classes? There are LOTS in HK (:
(sorry i dont know which p.chan or joseph li you are referring to)
You can try 英皇教育/现代教育/遵理教育

For 英皇教育:
Mia Wong, Cindy Wong, Alex Chan is quite good.
They focus on both speaking and writing. They give you MANY useful vocabularies.
You can refer to this website for further information:
http://www.kingsglory.edu.hk/kge/kingsglory/2011regular%5CF401A1.pdf

For 现代教育 Nickkita is kinda good. She has alot of pastpapers from different schools in HK. This is her website:http:http://www.modern.edu.hk/teacher-Nickkita.phtml//www.modern.edu.hk/teacher-Nickkita.phtml
Hope i can help