Keep to the word limit.
Always read what you are asked to do carefully and make sure you understand it.
Use examples to support your arguments.
Spelling is important, spend some time to check your answers.
CHECK punctuation, grammar, subject/verb coordination,.
Remember that days, months, years, countries, languages and nationalities start with capital letters.
Plan your IDEAS and make a good paragraph plan before you write.
Try to avoid repeating the same words.
Write CLEARLY. Good handwriting !!!
Good format is also very important. Follow what you've learnt for different writing genres.