There are three secrets to writing a good A+ essay.

1: Agree with the teacher, even if you don't. Listen to your teachers and get a good idea of what their opinions are about the subject they want you to essay, and then play up their confirmation bias.

2: Fuck around with spacing and shit. Even the smallest, most difficult to measure change in word spacing or margin size will gain you significant page length. 

3: When it comes to fluff, use your creative writing skills to make the fluff seem less boring. If you can pull off humor in a professional way, do it, because your teachers appreciate something that isn't shitty and dull after reading thirty other essays that are probably mostly shitty and dull themselves.