Everyone starts with a default CEP grade (starting point may differ for scholars).

CEP is discussed every year, but adjustments are usually only made when some level of consistency is seen (either 2 - 3 years of above avg or below average performance). Don't expect your CEP to be adjusted from getting a B grade in 1 year.

Adjustment is also dependent on the number of years of service left.

There may be some level of subjectivity based on the school (SSC that is more conservative or more generous), but since the decision involves the Supt, you can also expect some sort of standardisation in practice across schools.