How do you use 90mins to write 6 short essays? It is very difficult as i always run out of time.

The best way to tackle this is to practice strictly with time before the exam. I understand your frustration with the time limit especially when you know a lot. Doing loads of essay plans is very important in order to go straight to the point and not waffle. You will notice that most of the questions require the same answers but in a different way so all you need to do is to engage with the question and use the knowledge you know to answer the question. When writing your essay make sure you spent 1 to 2 minutes planning so you can write smoothly and not get confused. Remember also to write relevant information to the question. For example, if the question is asking about religious experience you should discuss key scholars first such as Richard Swinburne