PRIOR TO THE EXAMINATION: WRITING PRACTISES
To produce a good narrative essay, first you need to brush up your grammar. It does not work if your grammar is not that good. Get help from your friends and english teacher especially because they know what they are doing; plus that is what they do - teach you!
Buy if you can afford to, if not borrow grammar books, example of english essays, and anything that is related from friends or library of your school because by reading it will improve your english skills.
There is always a friends that 'master' a certain subject and for this identify your friends who have the highest marks in Continuous Writing among you. Read his/her essay and try to relate his/her writing to yours. It is not a bad thing to copy the way they write the essay as long as it involve study and education.
Try to find time to write an additional essay (which is your own personal essay; not homework) for two or a week times and asked for your teacher's comments. As for me, I started to write additional essays after finishing my trial examination because my bahasa Inggeris grade was the lowest among the 10 subjects that I took. I started a bit late, but you should start NOW while you have the time. Believe me it helps a lot because for my trial I got a B but for the SPM examination I got an A+ for bahasa Inggeris and English GCE-O an 1A. English GCE-O is the marking standard of British English and it only takes the marks of your Continuous Writing. See how important it is for you to excel in Continuous Writing.