Entry test practise for highschool?

I want to enter this selective high school. I am currently in year 8 and I am applying for a NSW selective high school for year 9. I need to do an entry test next term and I want to maximise my chances to get into this school. Can someone help me by giving advice on how I can prepare for the exam. Maybe you could give a site that has samples of questions that are similar or can tell me how to prepare etc.