If an examiner clearly sees that your essay is likely to be plagiarized (they can easily be calculated with the help of the Internet), they will always find an opportunity, based on objective parameters, to not give this work a high mark.
Much more appreciated are the attempts of children to reflect, think, argue on their own, live emotion, it is very appreciated when a person demonstrates their wide outlook, range of reading and general erudition that goes beyond the school curriculum. It is understood that in such a case, the expert may encourage for the originality of the argument, for its relevance to the topic. So, in general, there is a wide variety of entries. Unfortunately, there are fewer good works than unsatisfactory and just average, but I think that those good works that we see, will get a high score and create a real advantage for the bright interesting guys at the admission.