Direct to school jobs

Good morning!

How are your experiences with direct to school jobs? Applied weeks ago and it is still marked as 'open for application'. My status is still 'submitted' and I wonder if they close when they found their candidate or if they already close it when you don't fit in their scheme but others can still apply? 

My second question is about the interview procedure. Got an invitation for Skype, replied but no answer so far. Is it normal that you have to wait one week and more till they return to you to schedule an interview? 

TIA and have a nice day