Just to add to this; during Main Round all preferences will be considered equally (other rounds only consider first preference):
Quote from UAC: "Are all my preferences given equal consideration? If I have something as my ninth preference, will it get considered in the same way as someone who has it as their first preference?
Yes. If you're not selected for your first preference, you'll be considered equally with all other eligible applicants for your second preference and so on. Your chance of being selected for a particular course isn't decreased because you placed a course as a lower order preference. You won't be selected for a course just because you entered that course as a higher order preference.
For example: Anna doesn't qualify for an offer to the courses she has listed as preferences 1, 2 or 3, and has course 116677 as preference 4. Anna is eligible and more competitive than Blair and Catriona, who have both listed course 116677 as their first preference. Anna, therefore, receives an offer ahead of Blair and Catriona."
All the Best!