Talk to your high school counselor or your college adviser. They can give you some essay examples and you can have them proofread your essay once you are done writing it these professionals will have insight into what the admissions officers are looking for in an essay. And it is always a good idea to have one or two people read over your finished essay in order to make sure there are no grammatical errors.
Make your body descriptive and clear. Use multiple paragraphs if necessary. A custom essay has details embedded into the topic and those details have to be discussed separately. The use of details can be strengthened by using valid examples. Do not hesitate to quote experts on the topic and make sure that appropriate references are included. Attach a bibliography at the end of the essay if you have to. Make sure that you address the topic diligently.
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.