i dont want to sound like a party pooper...but getting that high UAI with those subjects seems almost impossible but i still think you can get in the mid 90s
Re: Study tips for these holidays - What should I be doing?
http://community.boredofstudies.org/819/general-discussion-2009-hsc/184521/hsc-study-motivation-tips.html
have a look at this
dude, u can easily get in the top ranks in all your subjects from here until the trials.....it's just about putting ur head down and work hard!!!
so 98 imo is still very achievable.