I guess English language is a major problem for many of the students out there. The best advice I can give is really to read a lot. Borrow books from the library, read the newspapers, magazines, etc. It would even be a great help if you can read the whole Harry Potter and the Chronicles of Narnia series. Reading isn't boring, if you can get hold of these interesting stories to read. My favourite books which I used to read were the Sweet Valley series, books by Amy Tan, Sue Townsend, etc.
Throughout my years of tutoring and observations of other people, I found that many people do not have a good grasp of grammar. It is very important to get your grammar right because it forms the foundation of your mastery of the English language. If you can't even get your singular or plural, past or present tenses right, it would be tough to improve your writing and speaking skills. Hence, I place a great emphasis on grammar in my English lessons for my students. Get your basic grammar right, and you would have gotten most of your marks.
The additional marks are pretty much bonus points for your ability to express yourself in more "flowery" language. And to do that, brush up your vocab! This again, comes from reading a lot. While you are reading, have a pen and notebook by your side to take down any good phrases or words you come across in the book. Then in your next composition assignment, try to use these words or phrases in your writing. The more you use them, the better you will remember.
Tips for learning English
1. Improve your vocab! Learn 10 new words a day. Have a small notebook with you where you write down 10 new words you learn each day. You can get these words from the dictionary or whenever you encounter them in your reading. Learn the definitions, and try to use them in your next composition writing or in your conversations.
2. For other subjects like maths and chemistry, you need to practise, practise, practise. For English, you need to READ, READ, READ! Read English texts as often as you can. This could be the news, novels, or magazines. Choose an interesting text that is not too difficult for you. Try to note down good phrases that you can use in your next composition assignment.
3. Practise writing everyday! How about starting a journal where you can write about your daily life and your thoughts, your rants etc. Ten years down the road, you can read your journal again and look back on your past. It would be fun!
4. Study with friends. You can practice doing grammar exercises together and have English conversations together. Furthermore, as you study English together, you can help each other with questions you may not understand.
O Level English Exam tips form examiners
GCE Study Buddy: Sec 3, Sec 4, O Level free online revision notes and study guide