Scoring 90% or not they will select only set total number of candidates irrespective of fixed mark as cutoff in written exams.For example they need to have 30 candidates for GD/assessment then they will select top 30 people who scored maximum marks in written.
This is the trend the have been following since they restarted CAE assessment in 2010 when they use to say all those selected scored more than 70%
Unofficial word is that they want to have a pool of 75-90 pilots with dozen of experience copilots/captains on the move for betterment come end of this year.
CAE was supposed to conduct 3 written exam for CPL holder this year to accommodate 50 pilots or so in pool while type rated batch of backlog's get absorbed by Jan/March 2014.