Another important basic is to write at least 250 words. Writing less does not answer the question, which tells you to write at least 250 words. If you write less than 250 words, the examiner marking your paper will give you a maximum of 5 for Arguments, Ideas and Evidence or even less. It is no problem to write more than the 250 words; there is no upward word limit on the essay. Time is your only constraint.
The question wants you to produce an essay. Therefore don't give a list of numbered notes (your paragraphs should not be numbered). Give the examiner a proper essay with an introduction, a main body with your ideas and evidence and a conclusion, all divided of course with the paragraphing techniques discussed above.