I assume there are few visa offices (like Bangalore) that deal with Student Visa Applications. May be large number of PR applications + students visa are causing the delay.
I have applied from India. So I hope it is NDVO. My timeline as follows
Category: PNP
Outland( I am applying from India)
AOR:Feb 11,2016
Med Passed:4th Apr 2016
PPR:waiting
My agency told me that the students visa applications are expected to be settled by 17th August (Today). So i think we can expect some movements after today.