Tamil Nadu Public Service Commission (TNPSC) conducts the Combined Civil Services Examination–II (Group-II A Services). Here are the details of this examination:

Eligibility:
The applicant should have completed graduation with good academic record from any recognized university of India.

Application form:
Students can fill the application form online through the official website of the TNPSC at the time of availability.

Important dates:
Last date for submission of applications: 05.03.2014
Last date for payment of Fee through Bank or Post Office: 07.03.2014
Date of Written Examination: 18.05.2014 10:00 A.M. to 1:00 P.M

As you can see that all dates are over so you can not apply for this vacancy, you should wait till the next vacancy announcement.