I'll suggest another way to make things take up just a wee bit less space. If you are using Arial and Calibri, I'll assume you are in Microsoft word. Select it all, then go to Home>Font. Then click on "Character Spacing". One of the options is Spacing. Choose "condense by" and give it a small number (say, 0.6). Tweak it so it looks right.
And another thing, perhaps you have someone who can help you edit brutally to cut some of those words? It actually is a good thing that you have so much to say, but it probably would make your essay stronger to go through with a red pen and get rid of any repetitious phrases, condense your thoughts, and make the whole thing more concise.