Pick one side.
Do not waver. If you are calling the argument weak, stick to it. And pile up reasons as to why you find the argument badly structured. Take it to the end and challenge the author’s conclusion from the reasons he has stated. Attack the links between the reasons and the conclusion. If you are with the author though, stick to that and tell the reader why you find the argument valid. Validate the conclusion by bolstering the link between the reasons and the conclusion. A wavering mind does not make a good essay.
We all understand arguments better with analogies and examples. So, feel free to make your essay more conclusive with examples that people generally relate with. If you want to make a point with a reference from football, go ahead. This also makes your essay an engaging read. Furthermore, it makes the reader understand that you have understood the argument and you have gone a step further in extending the concept to an example outside the argument.
Your examiner reads the conclusion and goes ahead to score your essay. So, the conclusion that you present, whether you disagree with or praise the author needs to be good enough. Spend some time in coming up with a convincing conclusion. The conclusion should state your perspective in a few words, without scope to be misunderstood.
Stick to short and simple sentences
You are better off writing smaller sentences. Loner sentences generally mean that there are more opportunities to go wrong with the sentence construction, grammar and phrasing. So, stick to simple language and focus on getting the context right. And remember, no one likes long winding essays that go on and on.
Decimate the opposition
When you invalidate an argument, go the extra mile and convince the examiner that the other side of the argument holds no water whatsoever. Include this in your conclusion to make a very strong point out of it.
Make time for editing
This is of utmost importance. When you time yourself, make sure you have enough time to read and edit what you have written. A cursory read will not suffice here as you will have to correct typographical errors, grammar mistakes and spelling errors. You will also have to rephrase, restructure and rewrite parts of your essay after reading it once. So, it is mandatory that you make time for editing the essay you write.