Good point..
But still, they give us 2 years or so for a reason right? There's no rush, but I guess there's no harm in learning the basic concepts early on.
Keep that motivation, but you don't have to start this early or you are seriously going to burn out when it counts the most. Get your prelims sorted first, and if you want start halfway through or even the last holidays before HSC like I am doing. Studying these holidays before year 12 is already an advantage over some who will start later.
THIS
I did two of my subs last year, and this year i burned out to quite an extent. The HSC became like shit.
Not enough pressure can in ur final year of schooling can also become ur weakness, as u fail to motivate urself.