Here are few tips that I learnt through the hard way:
(1) First, highlight the points.
Ask yourself the question and choose the best points. There are usually more than 10 points (around 13-14 points). Choose wisely, or you will lose marks and too much words are used.
(2) Copy exactly the points from text.
Even if you think you know the meaning well enough and want to change the words, DON'T DO IT. If something goes wrong, you would just lose more marks.
(3) Arrange the points accordingly.
NEVER EVER jump from last point to first point. Don't do it backwards, and if you want to skip a point, still answer it accordingly.
(4) Make sure to count the words.
No more than 120 words. Exceed it and you lose marks.
(5) No extra paragraph and intro/conclusion.
You're just wasting your time by doing that and you had no time to lose during the real exam! You won't even get marks for that.
(6) Check, check and check.
Just check it. Even if you think you're mostly correct, check again. Perhaps you missed some words coincidentally, who knows. If the clock still ticking, just check you answers till you're sick of it.