Some of the most common corrections we make in essays:
Clichés: often wordy and trite, just avoid them like the plague. (joke intended)
"Thing": there is always a better, stronger word or a way to rewrite the sentence to eliminate this word.
Compound words: alot? highschool?
Proper nouns and capitalization errors: maybe it's the texting generation, but proper capitalization matters. It reflects attention to detail and understanding of grammar.
Overused phrases: ...will be able to... ...will allow me to...
Comma usage. Maybe students don't have a love of commas, but they do matter, especially for the reader to see that the applicant understands basic grammar rules and read the essay as the applicant intended.