Assumptions.

Around 270 to 300 candidates would have been called for interview this time.
no. of seats could be 60 to 85+ by seeing the past trend.

How?
As Interview schedule was:

Karachi: February 20-22, 2017
Lahore: February 23-24, 2017
Islamabad: March 02-03, 2017

Candidates were called for interview Alphabetical wise. At most 40 to 45 candidates would have been called on a particular day for interview.
Candidates who have appeared for interview can confirm the number of candidates appeared on that day.

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