First and foremost, students must learn to work ahead of time. Most essays are given in advance. However, many students wait, for various reasons, until the last moment to work on their essays. Waiting until the last moment creates an environment where a student has very little time to proofread and correct his/her writing. Students frantically try to push out an essay in an hour or two and think that's the best they can do. Good writers do not wait until the last minute. They write and revise and revise and revise and revise. Indeed, good writing is not found in the writer who can complete an essay the fastest, but good writing is found in the writer who spends as much time as possible perfecting his/her work. Spending about an hour a day (between the date the essay instructions are received and the due date) on an essay is a good place to start.
Now, I'm going to depart from the normal essay structure here for a bit and define some of the most common writing errors: run-ons, comma-splices, and fragments.
A run-on is a sentence that fuses two or more complete sentences together into one long sentence students who commit this error fail to recognize that punctuation helps the reader more clearly understand the ideas in each sentence.
A comma-splice is similar to a run-on, it occurs when a student fuses two complete sentences together with a comma, a comma is not a strong enough punctuation to join two sentences together.
When writing sentences, because they are so worried about creating a run-on. Students tend to forget to complete. The idea the sentence is about, which usually results in a fragment.The above sentences are examples of each of the errors they describe. The sentence describing run-ons is in fact a run-on. The comma-splice definition actually contains two comma-splice errors, and the fragment definition includes a couple of fragments.
Below are the correct versions of the above sentences:
A run-on is a sentence that fuses two or more complete sentences together into one long sentence. Students who commit this error fail to recognize that punctuation helps the reader more clearly understand the ideas in each sentence.
A comma-splice is similar to a run-on. It occurs when a student fuses two complete sentences together with a comma, but a comma is not a strong enough punctuation to join two sentences together.
When writing sentences, because they are so worried about creating a run-on, students tend to forget to complete the idea the sentence is about, which usually results in a fragment.

1. Read your essay out loud. Yes, it may feel awkward at first, but your ears will catch the errors your eyes may miss.
2. Read your essay from end to beginning. I may have mentioned this one before, but it's worth repeating. Start with the last sentence, read it, and move on to the sentence above it. If the sentence sounds odd, or a little off, then you know something needs to be corrected.
3. Have someone else read the essay. It never hurts to have another pair of eyes to read the essay. Professionals do this all the time, and if it's good for the professionals, then it'll be good for students, too.
4. Pay attention to subjects and verbs. Most of the errors that occur in student writing happen because students forget to pay attention when a new subject and verb appear.
5. One idea per sentence. One way of helping minimize run-ons and comma-splices is to keep in mind that the best sentences are the ones that express only one idea. Having multiple ideas in one sentence only confuses the reader.Using the above techniques will assist students with editing their own papers. Unfortunately, during a timed essay, students will not have the opportunity to use option three, but if they take their time with options one, two, four, and five, then they should be able to catch quite a few errors themselves.
But again, the most important part of writing students need to remember is saving time for these type of exercises. Waiting to the last minute will only result in substandard work, and instructors want to see students turn in the best work possible.