Why candidates fail in FPOE?

[Scarlett]

I would consider anyone who has made it to the Civil Services as a bright person. But it amazes me that people actually fail FPOE. How come and why?
Is it very hard?
And especially DMG people, they are the best of the best!

No offense intended, it is just a drifting thought...

[RiverFellow]

for renewel

[QaisarMehmood]

This examination is of considerable importance as inter-se seniority of the Probationers in each Occupational Group and Service is determined on the sum of marks obtained in the Competitive Examination, Initial Training, Specialized Training and FPOE. Currently, the rules provide four attempts to qualify the FPOE failing which the Probationer is liable to be discharged from Group/Service.