Hi Mehtajav...I applied on march 11/2015. So it means, from July 1/2014 to march 10/2014 (254 days) I was not entitled to Medicare.
So in the tax form I put 254 days. In your case you should be 357 exempted (from 1st july/14 to 22 june/15). With your bridging visa you can obtain your Medicare Card immediately (In fact I got it the day after I applied for my 887 visa...).