Warning: Speculation ahead. Speculation is injurious to your peace of mind. Please proceed with a grain of salt and reasonable caution.
Afaik they would give out 300 interview calls, and they're lookin' to get a hundred each from final and pre-final year. If they roll out interview calls in the last week of September, with a minimum of a weeks notice, interviews could start around the 3rd of October. Which gives them 11 days till the 15th, not counting the Sundays. Which comes to a little over 27 interviews a day.
Not completely un-achievable.
What I'm trying to say I guess, worrying means you suffer twice. It's still okay if we haven't gotten the calls yet.