Don't know how to write a good essay?

I am a History Undergraduate at Durham and studied History A Level at City of London School for Girls, giving me a pretty good idea of how to both write, and teach others to write a good essay. I won the Corpus Christi College, Cambridge history essay writing prize in year 12 and I have a thorough knowledge of exam technique. My area of expertise is 16th Century history, but I am also knowledgable in most of the other topics covered in A level, as well as GCSE.