Firstly you'd read the topic given carefully and then plan out your essay in bullet points and after that you begin. after writing that you finish and then read it over carefully until you're satisfied.
Explanation:
this is what i do
first I brainstorm my topic and start with my thesis and explanation points. Then I start to write my intro and 1st argument and so on until I get to the conclusion. The last thing I do is proofread my work a couple of times before I submit it.