1. Read the topic of your essay very carefully and ask yourself 'What should I write on it to make it effectively?'
2. You should well familiar of that topic.
3. While you write it, first think what should you write and then write.
4. Make partition on matter like:
*Conclusion(final decision), etc.
5. When you understand what should you write on it then surely you can write on very easily.
So, all the best!
Hope this may help you!