KEY 1
Budget your time carefully.

you have only a half hour in which to complete your work, You should use your time more or less as shown below::
Reading and thinking about the topic 2-3 minutes
Planning and taking notes 2-3 minutes
Writing the essay approximately 20 minutes~
Checking the essay 3-5 minutes

KEY 2
Read the question carefully. 

You must write on the topic exactly as it is given.

KEY 3
Brainstorm.

Before you begin to write, spend a minute or two “brainstorming.” Think about the topic and the best way to approach ti.

KEY 4
Plan your essay before you write.

You don't have to write out a formal outline with Roman numerals, capital letters, and so on. However, you should make some notes. By following your notes, you can organize your essay before you write, leaving you free to concentrate on the task of writing.

KEY 5
Be sure your handwriting is as clear and legible as possible.

Handwriting that is hard to read may unconsciously prejudice the readers who are grading you essay. Be sure your handwriting is not too small or too large.

KEY 6
Follow a clear, logical organization.

All TWE essay should consist of three basic parts:
An introductory paragraph
An body: consists of two or three paragraphs.
A concluding paragraph

KEY 7
Use concrete examples and specific reasons.

Whenever you make a general statement, you should support it with specific examples.

KEY 8
Use signal words to indicate transitions.

Signal words can be used to join paragraph to paragraph and sentence to sentence.

KEY 9
Use a variety of sentence types.

Good writing in English consists of a more or less equal balance between short, simple sentences consisting of only one clause and longer sentences containing two or more clauses. Therefore, make an effort to use sentences of various lengths.

KEY 10
Check your essay for errors.

Don't cross out long sections or try to add a lot of new material. Look for obvious errors in punctuation, spelling, and capitalization as well as common grammatical mistakes.