Don't memorize things instead learn and know something well. When you know something you can talk about it with confidence. When you know something you can certainly write about it. So most of the effort to memorize is unnecessary. If I ask you to write an essay about your sister will you first memorize? No, you don't need to memorize information about her instead you can easily write an essay about her because you know her. When we know a thing we don't need to memorize it. So know and learn things and reduce the burden to memorize. You only need to memorize few things like formulas and some facts. Thank you and have a good day. :-).