Well, congratulations on completing your junior years. Remember that the senior years will require an exponential amount of workload compared to the junior years, so make sure you remain focused and you shall succeed in your goal.
On how to improve and maximise your potential in English Advanced: check out my responses in the threads below:
http://community.boredofstudies.org/showthread.php?t=315916&p=6480049#post6480049 (my top tips for doing well in English Advanced)
http://community.boredofstudies.org/showthread.php?t=315158&p=6471238#post6471238 (features of a stellar essay)
On how to achieve consistent study patterns in senior years:
http://community.boredofstudies.org/showthread.php?t=315886&p=6479509#post6479509 (my top tips on how to not burn out)
http://community.boredofstudies.org/showthread.php?t=315131&p=6471248#post6471248 (my top tips on the best way to study during the term)
http://community.boredofstudies.org/showthread.php?t=315658&p=6476770#post6476770 (How much you should study in the holidays-applicable to preliminary and HSC years)
In this summer holiday, you should focus on making sure you have a prepared psychological mindset for senior year studies, i.e. it is all very well to have a very positive attitude of work hard and put the hard work in, but what I mean by psychological mindset is you must have a much tougher mindset to prepare you not just for the much greater academic rigours of the senior years, but also a corresponding increase of expectations-i.e. taking more responsibility for your self-learning, more proactive role in asking questions when you don't understand instead of blaming the teacher for not teaching the syllabus content thoroughly enough, significant increase in work load, and basically you need to make sure you have consistent performance in all your subjects-consistency is very important-both in your academic performance(I am talking about at optimal levels) as well as consistency in your study routine, learning methods and sleeping patterns-don't study 24/7 because you will wreck your body and by then your atar will become meaningless if you destroy your health-take care of yourself, do relax a bit in the holidays-you need enough relaxation to get you to keep working very hard for the next two years-and I think if you prepare your psychological mindset over the holidays, it will help you even more than pure attaining academic knowledge for year 11.
Essentially, make sure to keep healthy-a healthy body allows you to have good results. Construct goals and be prepared to stick to it (long term and short term ones). If you have any questions about studying in senior years-you are welcome to pm me-best wishes for achieving brilliant results in the next two years