At first you have to register yourself as student through website of ICSI that is www.icsi.edu. Actually there is only one institute entire India that provide CS course it is ICSI . In Palakkad they they have centre you can go and get info from there.
You have to see if you want coaching support , you can search coaching classes in your city or some good online classes are also avilable i.e super profs, ACE Tutorials, etc.
Company Secretaryship is a professional course. You can register yourself with Institute of
Company Secretaries of India. Contanct Palakkad Chapter for registration (http://www.icsi.edu/palakkad/Home.aspx).
All the Best
Good to know that you want to join CS . Actually there is only one institute entire India that provide CS course it is ICSI .
In Palakkad they they have centre you can go and get info from there.
Website : www.icsi.edu