To be honest, i did no study at all in year 11. I think i may have started studing for yearlies a week before they started and it was nothing major.
Although i would try a tad harder if i went back and did it again, its important to remember that ultimately year 11 means nothing and you shouldnt study to such an extent you burn out for year 12.
The other tip i can give you is make sure you go into year 1 mode at the beginning of term 4
I didnt and just cruised through my first assessment tasks...
You don't wanna be like me and have to come first by a wide margin in your half-yearlies to reclaim your rank haha