As an essay writer your main task is to research and develop a coherent argument within the quite formal structure of an essay. Grammar spelling and punctuation are extremely important when writing an essay on a subject which calls for good language skills - English Literature for example. However an essay on other subjects also needs to adhere to similar grammatical standards. The rules of grammar exist for a positive purpose such as ease of communication and to avoid ambiguity not simply for some arcane reason lost in the mists of time.
Nevertheless it is true to say that a student with excellent grammatical standards will hold an advantage over a candidate who may excel in every other way. This is what essay assistance is designed to counterbalance.
The more scholarship essay examples you read the better prepared you will be to write your own essay. The essay portion of your application is the most important. The essay is the first impression and quite possibly the only time you will have the opportunity to give an impression of who you are. And that impression is only as good as the way you write your essay.