There are a few tests at the end of the year for all of your subjects, which they only use if something traumatic happened during the GAT so they can't take your GAT results. Otherwise, it's all g, just read over a past exam or two on the morning to get a feel for it but I wouldn't stress too much, a lot of people just sleep or walk out half way and they're still able to get in prestigious universities such as the University of Victoria 
What the fuck did you just fucking say about me, you little bitch? I’ll have you know I graduated top of my class at James Ruse Agricultural High School, and I’ve been involved in numerous secret study sessions on quantum physics, and I have over 300 confirmed atar points. I am trained in rote learning and I’m the top student in the entire VCE selective High School system. You are nothing to me but just another rank below me. I will wipe you the fuck out with essays the likes of which has never been seen before on this Earth, mark my fucking words. You think you can get away with saying that shit to me over the Internet? Think again, fucker. As we speak I am contacting my secret network of IST teaches across VCE and your IP is being traced right now so you better prepare for the storm, maggot. The storm that wipes out the pathetic little thing you call your ATAR. You’re fucking nothing, kid. I can be anywhere, anytime, and I can out-smart you in over seven hundred ways, and that’s just with my bare brain. Not only am I extensively trained in further maths, but I have access to the entire arsenal of VCAA and I will use it to its full extent to wipe your miserable ATAR off the face of the continent, you little shit. If only you could have known what unholy retribution your little “clever” comment was about to bring down upon you, maybe you would have held your fucking tongue. But you couldn’t, you didn’t, and now you’re paying the price, you goddamn idiot. I will shit fury all over you and you will drown in it. Have fun at TAFE, kiddo.