Print it out!
Nowadays, students frequently submit their assignments online. They write and edit an essay on screen and send it off with the tap of a key. Printing it out seems unnecessary and it’s costly. But I’d advise you to print out your work just once — ideally when you feel it’s almost finished. Looking at the pages in black and white allows you to spot any repetition of sentences or phrases more easily than on a screen, and you’re more likely to notice awkward wording or typos too. Try it out. I can guarantee you’ll find errors you hadn’t noticed before — and I’ll bet there’s at least one mistake in that all-important introductory paragraph.
22 March 2017