Well my first piece of advice would be to try and look at your weaknesses and why you don't believe you will get over 90, because direct entry is the easiest and safest way.
The other two options would be to do Health Science and then transfer into Physiotherapy at La Trobe or to do a Bachelor of Science and then Doctor of Physiotherapy at Melbourne.
The first option I won't recommend purely based on the fact that if you didn't get into Physiotherapy to begin with by quite a large margin, which will be you if you get in the 80s, you won't stand much of a chance against those who narrowly missed out.
The second option is better, you won't get into Science at Melbourne with an ATAR of 85, but you should get into Science at Monash, from there, work your way up and get into Doctor of Physiotherapy. But this way also has it's issues, it's not easier than direct entry.