I've been extremely lucky throughout my VCE studies to have very helpful teachers. They are always happy to provide extra handouts, helpful websites, extra questions, etc.
Having said this, I have great difficulty with Chemistry. If you are having trouble with a subject (due to a teacher or not understanding the concepts) there are a number of things you can try.
~ Ask around other local schools for extra tutoring and if you are able to 'sit in' any revision classes.
~ Go to the website:
https://connect.yourtutor.com.au/default.aspx?GUID=d8e05a7b-e8d2-4f25-8789-33e636e5403d# this is a free tutoring service for grades 3 and up, and continues through VCE and TAFE. It operates Mon-Fri 4-8pm for free. There are options to go later and work on the weekend, however you do have to subscribe and pay for this extra feature.
~ Have a talk to your support teacher or year level coordinator and see if they realise that your teacher is not providing the necessary support s/he should be. See if you are able to change to another teacher in the same subject. If not, then see another teacher personally and explain the situation. Ask they would be happy to assist you.
~ If all else fails, ask other students in the same class to see if they feel the same as you do about this particular teacher. If they do, see if you can get a petition running to try to either gain more educational support and/or a different teacher.
All the very best with your studies!