Unless if you finished way ahead of schedule, don`t worry about major revisions like reorganizing the structure of the essay–it`s better to hand in an essay with an imperfect structure than a paper that`s impossible to follow because you had to stop halfway through the revision process.
The most critical part of the essay-writing process actually happens before you write your first word. When you flip to the essay question, make sure you read it as carefully as you can, noting the difference between words such as `contrast` and `analyze` and highlighting any details which the professor specifically instructs you to include. It`s not uncommon for excellent essays to receive low marks because the student answered a question other than the one that was asked.
If you did your best to write a complete, clear, and insightful essay within the time allotted, you should have nothing to worry about.
For this reason, it can be helpful to simulate the conditions of a timed exam before the actual day: pick a practice question, find some lined paper, set a stopwatch, and see how you do!
When composing essays, many students stop and read over each paragraph once they finish it, making sure that it`s well-written and free of errors before advancing to the next one. This approach is entirely logical when there`s no time pressure involved, but it can actually work against you during an exam.
Do your research: Read primary and secondary sources and take notes to help you work out your position and angle on the topic. You`ll use these as evidence for your points.