Now I assume that you have a 10-page work written, ready to be submitted. But don't succumb to the temptation of getting over with the torment by handing in the work at this stage. Remember that revision is as important as creation. Re-read your work several days later, after you have been refreshed from the break. Then you should be able to spot some errors.
Errors can be simply grammatical or typographical.
But there are other types of error which are more difficult to notice such as incoherence of arguments, repetitions, unfulfilled promises, loose ends, exaggerations, wrong accusations, or faulty paragraphing, etc. But impossibility to attain perfection is not an excuse for you not revising your essay. By adopting a rigorous process of revision, you should be able to come up with an essay with a clear main argument, supported by textual evidence laid out in clearly defined sections. Haphazard writing is not academic writing. In other words, one point should lead 'logically' to the one following it.