升中後跟不上英语程度

Before you even get started, you need to have the "can do" attitude. If you keep using excuses "I don't have time for this" and "I don't want to do that," you will spend the rest of your life finding excuses.~ Invest in Yourself ~
讀 -- Read books. You can find all kinds of books in the library. Read the easy ones first. Use the dictionary for words you do not understand. It is OK to read books with words & pictures. It is OK to read the same book several times.

聽 -- Listen while you are watching the English channels on TV. The pictures on the TV will help you understanding what you are hearing. It is OK to watch cartoons. (Actually, they are the best.) Watch documentaries. Watch the news. You will not learn from the music channels (they do not always use proper English.) You will not learn from the sports channels (they talk too fast for learners.)

寫 -- Practice writing.
抄書 -- Copy a paragraph a day from the books that you read.
作文 -- Start writing diary in English. Write at least something every day. Use spell and grammar check (as with a word processor.) Do not worry if your writings are good or not. No one will see it. No one will care how much you write in your diary. Post your questions in English. You will not learn until you force yourself to practice.

講 -- Practice speaking.
唸書 -- Recite a paragraph a day from the books you read.
會話 -- Talk to your friends/sisters/brothers/parents/teachers in English. . Talk to yourself in front of the mirror. Record yourself speaking. Play it back to yourself. (You can send phone messages to yourself; use digital camera/recorder, media recorder on computer, Web cam, tape recorder, etc.)

Do these every day for at least a year. (Not just for several days, few weeks or couple months.) I guarantee your English will improve. If your English does not improve, tell me about it. In English, of course.
http://www.dailyenglishquote.com/
http://siuhoiyat.com/
http://www.englishclub.com/grammar/
http://grammar.ccc.commnet.edu/grammar/

找本簿記下平日接觸過的生字。
看字典後頁既生字圖，那些都是些常用的生字。
每日看一篇英文文章。

不要緊，你只輸在起跑線上，賽事尚未完結，加油。