Well, I'm not sure about, like 10unit or 12 units in total for subjects? I don't know ANYTHING about it..
but i want to do:
English Advanced
Maths ext 1 and 2
Physics
Chemistry..
that's all i have in mind so far..
Okay so basically the Asian 4, don't worry I'm not surprised!
English Advanced - Not much preparation needed but try your best to improve your analytical skills and essay writing skills throughout the year. Improving your creative writing is also a good idea! Learn all your language and visual techniques! Your school should prepare you for Year 11 by introducing you to an area of study along the way.
Maths Extension 1 and Advanced (2U + 3U) - If you know all your Year 10 Level 3 Mathematics due to tutoring or something, start Year 11 work now, if you're not doing it in tutor or something already. Study ahead of school if you don't go tutor!
Physics and Chemistry - You can say get lost to the Biology topics in Year 10! The Physics and Chemistry topics in Year 10 are good for foundation for Year 11! But, they re-cover everything in Year 11 anyways.
Go on the board of studies website and get the syllabus for preliminary Chem and Phys and start answering the learn to/learn about syllabus dot points! Year 10 science does not require much effort so just start Year 11 work for Chem and Phys.
So far, you have 9 units which means you need a 1 unit subject and another 2 unit subject!
1 unit subjects could be like Studies of Religion 1 (SOR 1), Sports, Lifestyle and Recreation (SLR), Photography, etc. Most 1 unit courses only last for Year 11 only so they're terminating courses for the exception of SOR which you can do in Year 12 for the HSC as well!
As for another 2 unit course, there are two subjects that complete the Asian 5 the best: Biology and Economics
But you can do something else you may be interested in like Modern History, Legal Studies, Business Studies, Software Design Development, Engineering Studies, etc.
Year 11 requires you to do a minimum of 12 units.
Year 12 requires you to do a minimum of 10 units. (Extension 2 Mathematics, Extension 2 English, Extension History, Extension Languages are only offered in Year 12 UNLESS you are an accelerated student)
If you get a headstart now, there's really nothing that can stop you from getting the perfect ATAR of 99.95.
Since you go Hurlstone, do you live in the Cabra/Fairfield regions? If so, go to PEAK for Phys/Chem and go to Truongs OR Peak for Mathematics if you haven't already!
Also, welcome to BoS and enjoy your stay!