This happened to my mate's school in a subject. 1st got 94 and state rank, both equal second girls got band 6 but the one who rank 4th only got band 5: 89. Whereas the person who ranked 5th and 6th got band 6. So in short, No 1,2,3,5,6 got band 6 whereas the person ranked 4th got 89, which was quite dissaponting. So yeah, ace your externals and PRAY for those ranked in front of you so that they do well as well.