im sorry but i have no idea what a BA is like. what i most recommend, know what i do, is for you to repeat another year to gain a better a work ethic and study skills + ATAR. uni has a far larger workload than high school, and you WILL get kicked out if you fail a few times. i dont know how much work is in a BA, so do some research on that
dont believe what that guy says about HECs fees: you'll pay it off in the years that you've 'saved'.