Hello,

If you want to prepare for UPSC CSE then best of luck firstly. This is one examination which you can clear and becoming a civil service officer and you can change the environment actually.

Like after clearing the examination prelim, Mains and interview also you will be selected for some different branches like IPS, IAS, IFS, IRS etc. I'll clear you all the post details below.

1. IPS is the Indian police service post. You will be become a top most police officer. Who can order anything for prevention the crime. Your main duties are maintain the public peace, investigation and detection, drug trafficking, railway policy, discharge management, border policy, VIP security. This position give much more power to you.
2. IAS is Indian administrative service. A IPS officer duties are  includes policy-making and advising ministers on various issues, maintaining law and order, overseeing the implementation of policies of the Government of the State and the Central Government, collecting revenues and acts as courts in revenue matters, overseeing the expenditure of public funds.
3. IFS is Indian foreign service. A IFS officer representing India in embassies, high commissions, consulates and permanent missions to organisations like the United Nations. Protecting India's national interests in the country where he/she is posted.

This are main role of this officer. You will clear the examination and join any one above this.

All the best.