Can you tell me that why there is a wide chasm between marks of Essay and Precise & Composition paper of so many candidates?

A candidate who scored 55 in last attempt managed just 23 this time around in Precis & composition.
The same person achieved 17 in Essay in CE-2013 and now has managed 45.

This manifests that there is no standard or consistency in checking/marking method at all. A lost depends on the whims of a checker.

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"If we don't stand for something, we may fall for anything."