Use this checklist to ask questions about the big picture (macro-features) first:
Have I signalled my assignment structure in my introduction?
Does the argument in my introduction match the one in my conclusion?
Have I supported my topic sentences with explanations, examples and evidence?
Have I indicated my purpose in my introduction? Have I stated the significance of my ideas in my conclusion?
Have I compared, discussed, synthesised and critically analysed ideas?
Have I answered the question?
Then check micro-features like word choice, punctuation, grammar and spelling.