To get high marks in HSC English, my teacher said that you have to impress the marker with your grasp of English vocabulary. To do this just simply write strings of words that are made of really strange and complicated (the harder the better- its better if both you and the examiner don't know the words).
For example, if you were asked to write a sentence on a dog, and it was a 10 mark question:
1-2 mark answer: A four-legged animal
3-5 mark answer: A four legged carnivorous creature
4-7 mark answer: A four legged carnivorous creature that has been domesticated from wild wolves
8-9 mark answer: A four legged carnivorous creature that has been domesticated from wild wolves which has often been referred as "Man's best friend."
(To get the highest marks, you must utilize the most important and complex words man has ever known)
10 mark answer: Canis familiaris, fertal offspring, canine, female form = b*t*h, 1337K9, justf***ingoogleit...