Yesterday I received a question about whether your chances of being shortlisted improve if you are among the first people to submit your selection criteria.
The answer is no. You will be shortlisted on the quality of your application, not when you submitted it. You just need to submit it before the deadline.
In all of my recruiting experience within the public sector I have never seen the panel favour early submitters.
Recruitment in the public sector is different to the private sector. In the private sector organisations have no obligation to consider all applications. If the consultant or recruiter has seen five fabulous resumes within the first five minutes then the rest may miss out.
In the public sector, at most levels, the panel are generally required to review all applications. The exception to this is the senior executive level where appointments may be contract and not subject to the same rules.