I'm studying for the GAMSAT postgrad medical school entry test (MCAT for you Americans) and a huge part of the test (1/3rd) is an essay-writing section where you have to write 2 essays in 1 hour based on quotes you get given on the day.

I haven't read a fiction book since early childhood, and the only thing I read is shit like clinical trials or non fiction history. My essay-writing is complete shit and I have the vocabulary of a 12 year old because I never have to use flowery language or even write basic shit like argumentative essays.

Does anyone know any good free online courses or youtube channels I can watch which are like a crash course on writing so I can start from the ground up and learn how to write essays in a nice structured form? And then how I can learn like 1000 new flowery words to make me sound smart?