Hey there,
Yes I have done very similar to you- Exercise Rehab and then Graduate entry Masters of Physio. Where will you be studying? I could give you more advice if you are going to be at Curtin.
From my experience, I'd say brush up on your anatomy loads- in my case it wasn't too bad because we covered a fair bit in my undergrad and I like anatomy anyway. There are a lot of good resources out there: check out youtube and the user 'hyperhighs' who makes awesome anatomy drawing videos. So simple and clear.
That's probably the main thing- the rest you will learn as you go, you will be fine