Hello aspirant,

UPSC (union public service commission) is a all India exam not for a particular state every year more than two lac aspirants give this exam it is  as it is a all India exam.

About ias exam...

IAS Exam, also known as Indian Administrative Service, is a national level competition exam conducted by UPSC annually to recruit candidates for civil services like IPS, IFS (Foreign), IAAS, IRS, IDAS, CAPF-AF and others. Nearly 2 lac candidates appear for the Civil Services Examinations each year.

IAS Prelims Exam tests  consists of General knowlege and Mental Aptitude of the candidates. 

The IAS Exam Pattern consists of three stages ...

Stage 1: IAS Prelims 

Stage 2: IAS Mains 

Stage 3: Interview/ Personality Test

Good luck