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May 2012 - Graduated (1st Class Honours, Science Degree)
Jun 2012 - Joined Civil Service (MX13, Office Job, Non-Scholar) => Pay 3800+
Jun 2013 - Promoted to MX12, Performance Grade B (2.5 mths) => 4300+
Apr 2014 - Promoted to MX11, Performance Grade A (3.0 mths) => 5000+

Question 1
From MX12 to MX11, promotion increment is $250 while merit increment (grade A) is $450+.
Does anyone know why promotion increment is so little? I am surprised because promotion is so rare in civil service.

Question 2
Anyway to guage my own CEP based on current progression and merit increment?
I understand that CEP does not mean that I will definitely reach them in my career.
I am curious because I am recently invited to a career development discussion with senior management.