Hello.
In order to become an IAS officer you will have to pass civil services examination conducted by UPSC, now if it is about highest post then I would like to inform you that you directly cannot take on the highest post, the highest post of an IAS officer in a state is chief secretary while in the top level cabinet secretary of the union comes, this post will be given to you after many promotions in the beginning level you will be posted with the common tags then after some promotion your post will be incremented, in order to be at the post of general secretary of union there are various options one may be the direct choice of prime minister and other includes your your experience so you need to have at least 12 year experience of working as a DM.
Best of luck.

UPSC Civil Services Exam

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