A few things to check before handing in the IELTS paper:
Does the argument make sense? Can you read it from start to end and understand its points? Does it answer the original question?
Have you shown some intelligence and variation with tenses?
Have you added evidence and examples to support your arguments? Each argument should have at least two or three sentences to back it up.
Have you added some ‘flair’? Improved the language with synonyms? Put in some variety in punctuation?