Don't make a goal as high as this lmao. In all honesty, if you really want to make a goal, create one with a range. 99.95 atar students quite literally 95+ every subject and this can put heaps of stress on you in the long run which has a high chance to screw you over.
Most 99.95ers did not expect their atars to be that high (this is evidenced from several I have talked to in sydney). Statistically, the ones who fixated less on their atars and more about what they can do to maximise their final marks are the ones that will achieve such a hefty score.