In particular, your conclusion must always reflect the balance of argument in the main part of your essay. There is no party line in philosophy. What matters primarily is the quality of your argument. Philosophers benefit from discussing their ideas with others. It is a good idea to discuss the topic of your essay with other students.
Clarity is one of the hardest things to achieve in philosophy.
It is sometimes helpful to get a friend to read your essay to see if its central points are easy to grasp. Check the final version carefully, to see that it contains no obvious errors. Paying attention to them may help you improve your next essay. If you do not express yourself clearly you are not thinking clearly. Poor spelling is not normally directly penalised but it gives an impression of carelessness.