Is it possible? yes,yes,yes!
As you said, you still have Trials and on top of that you also have the HSC exam, which both have a significant stake in your ATAR. Work hard and study smart and you'll improve your ranks by heaps. At the moment, i would say you're sitting on an ATAR in the early to mid 80s - good work.
It's great you already know where your weaknesses lay. Just focus a bit more of your study time (not a lot, as you don't want to detract too much from your other subs) on English and Business, and take it easy with the rest as you seem to smashing be them
I know what i said above sound tough to understand: "im 1st in Gen and SS, i can't give that up!", though lemme tell you a 6th place across the board for everything will nab you a better shot at 94 than your ranks currently.
*Business is a whole lot of rote learning and memorisation + a mixture of common sense. If you're having difficulty and if you have some spare finance (see what i did there rofl) i could recommend investing in Edrolo.com. Basically, it has videos for every dot point of every topic + a case study, and the videos have been prepared by experienced HSC BS Markers (also, there are videos for Chem too). They're also about 2-4 mins each, very convenient. Also, if you should have a look at ********* Complete Course Notes which will set you back $25.00, but they're very comprehensive and have a relevant case study attached to each dot point (also they make books for General, Chem and English). Sorry if i sound like an ad, but those 2 things have really benefitted me a lot.
Good luck and i hope your study is very productive