SHOW, not tell
This writing tip is useful for the composition segment and will benefit you even as you grow older and need to write thesis or market proposals.
A good writer will draw an image in a reader’s mind, instead of telling him what to think. Always be specific, not vague.
Instead of saying: The weather was bad.
You can illustrate by saying: It has been raining cats and dogs everyday for the entire week.
Instead of saying: He was very rich.
You can write: He was so rich he could pay for a landed property downtown, drive a BMW and still afford to fly to Paris for shopping trips every month.
The teacher will be able to understand your composition better, setting you one notch above the other candidates.