I got a 90 in writing. I had to write two essays. The structure I followed was
1. First paragraph with 1 or 2 sentence introduction. One part about the topic itself. Second part about my opinion on the topic, if it was asked in the essay topic.
2. Second paragraph with 3 to 4 sentences explaining the topic and my view point.
3. Third paragraph with 3 to 4 sentences quoting an example and reiterating my view.
4. Fourth paragraph with 1 or 2 sentences concluding the topic and my view point.
No spelling mistakes, no grammatical errors, usage of not so common words etc.
Hope this helps.