If your eyes are fixed on the top-rated, highly coveted job of Executive Secretary of your organization, I will say it is a most lofty aspiration; which is not beyond your reach. If others can, so too can you.
My advice would be, wherever you are, tender first class performance. If your work is rated as substandard, it will be hard to convince anyone who matters in the selection process to fill the position that you are up to the task.
It is imperative for you to do your best to excel in every assignment you are given. Stay clear of second-rate work.