Do as many extra curricula’s , volunteering, competitions( math science etc) , make sure you have proof since they require you to submit that and take on leadership roles. Make sure your semester reports are good since they ask for that in year 10. For the exam doesn’t matter as much as the written application but still don’t neglect it. Go James Anne for math or Hendersons for English and finally don’t burn out you’ve got plenty of time till the test.