Tips for Writing in ESL Assessment

I just checked the result of my ESL assessment I attended on last Saturday. With anxiety, I saw an "A" appeared there as my score in writing. This time I got an A instead of a C that I got only one month ago. The difference between A and C doesn't mean that my writing skill and my grammar had improved a lot in the last month, absolutely not. Here are some tips which are very useful for those who haven't passed in writing. Believe me, they are extremely effective.
1. Control your time
To think about the quetion quickly and try to finish your writing quickly. It is very key to leave enough time to check your grammar, spelling and punctuation afterwards and make sure you can modify the mistakes as much as you can.
2. Keep your writing KISS
KISS means keep it simple and stupid. Remeber, the examiner only wants simple structure, simple ideas (2 main ideas) simple explanation, and simple examples. Don't make your writing too fancy. It is really not necessary to show your true literature and intelligence level in this assessment.
3. Make yourself familiar with TOEFL topics
To prepare for the assessment, you'd better to have a look at the TOEFL writing topics as mush as you can, and think about 2 main ideas for each topics. It will be very helpful to shorten your thinking time. From my experience, almost all the assessment topics are origined from TOEFL topic pool.
4. Read the Instroction Carefully
For the graph writing, if the instruction is asking you to give out the reasons, you should not describe the chart too much.
5. Write in a logical way
It's always not a good idea to make your writing a mass, which will definietly bring a headache to your examiner when reading what you wrote. So you can not expect for a high score because of it.