The length of the essay should be apt enough to meet the purpose, keep the reader gripped, and conform to any pre-stated space constraints.
It is important to understand that a redundant detail may take the charm away from an essay while an over condensed one may elude certain relevant details.
When you begin to write your essay for a standardized test, you must first decide what type of essay you are being asked to write.
There are many different types of essays, including narrative, expository, argumentative, persuasive, comparative, literary, and so on.
Most, if not all, high school and college standardized tests include a writing portion.
Students are provided a writing prompt and must then write an essay on the topic.
If you have time to review your essay before your time is up, by all means do so!
Make any revisions that you think will enhance your “rough draft” and be sure to check for any grammatical errors or misspellings.
In fact, someone has rightly said "Many B schools (including IIMs) have replaced the GD with a WAT (Written Aptitude Test)/Essay Writing test.
Others have added the WAT to their existing processes.