UPSC stands for Union Public service Commission will conducts the Civil services exam like IAS,IPS,IES,IFS etc....
Minimum eligibility for UPSC is as following conditions.
You must posses a graduation degree from any recognized university.
And you have to secure minimum 50% of marks.
The age is should in between 21-30 years.The upper age limit will be applicable for ST/Sc/OBC candidates.
3 years for OBC
And 5 years for ST/SC candidates.
You must be citizen from India.
For notifications see the following link...
http://www.upsc.gov.in