Here, What I will suggest that you must take following consideration while writing an Essay:
1. Writer must facilitate the examiner by making the Essay as easy to read as he can.
2. An examiner must not struggle to infer meaning out of the Essay, he should have every thing set on a Silver/Gold Plate.
3. We must keep our thoughts clear.
4. We must plan ahead and follow the line as we planned.
I think, that sums up the discussion on headings.
Thanks to Dr Farrukh, Imperturbable and Waheed Anwar.
I hope that I am not asking for too much when I say that why don't you people post your essays in the forum?
I don't mean the essays that you attempted in the exam.
Any essay from you people would do the job.
Some old essay that you have written for practice or,
some thing you wrote that will give us an idea about your writing style.
Point is that when we have an example from a senior, it becomes a lot easier to chalk out our plan.