IAS, IPS, and IFS selection processes are simply presented here:

Indian Administrative Service (IAS)

Highest Rank Of 

The Cabinet Secretary, The highest ranking civil servant

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Highest Rank Of Indian Police Service (IPS)

Director General of Police (DGP)  is the highest post in the Indian Police Service (IPS)

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Highest Rank Of Indian Foreign Service

The Foreign Secretary is the highest position in the Indian Foreign Service (IFS).

To know the complete information of IAS, IPS, IFS, touch on the link given below📷