idk whether your joking or not.
If you have done no study at all and intend to cram the whole year in one day...then no. However if your more inquiring about how to revise, or whether it is even possible to get >50 for your atar, then I guess we shall see?
So, in regards to ur sac scores. Withou tlooking at them further, i can't tell you for certain, but bad-average sac scores CAN give you a SS above say 25, however it would be best if your cohort is generally strong and the sacs were hard, and you do well on the exam. So a >50 is still possible theoretically, you can get less than 30 scaled on all your subjects and get above 50 (relaitve got scores like that got got 50.25) so it IS possible...I guess.
In regards to revising: I would reccomend starting ASAP and being prepared to commit hours a day if you want to cram, but bad habbits can be hard to break. The first step I would take is looking over the Study design and refreshing all the content you have done throughout the year, look over notes, past tests etc and just do your best to remember content. Then after that it is just SPAM practice questions/essays. This is a nearly universal truth for all VCE subjects, you do enough practie questions and things begin to look simmilar. It works best for like math/science subjects, but other humanities ones work well too.
Now if you wern't joking and your exam is LITERALLY tommorow...and you have not started ANY revision. Then at this point it is prioritizing and praying to God. Just look through ur notes quickly, identify where you sucked the most, do your best to adress where you sucked, and boom move on. Do ur best to get a good night sleep but also it sounds like u may need the time to do things other than sleep. May I ask what subjects you are doing?