For which examination or the purpose you are talking about isn't clear to us.

Now if you are thinking to contact the state government official web portal then type the name of the Department followed by Contact us on google search. For example, if you want to trace out the contact of State Electricity board of West Bengal. Then you just go to the google search bar and type 'State Electricity Board of West Bengal Contact us'. Press the search button and on the top you will get the contact us link. You can follow this instruction for your respective problem.

Now if you want a more specific answer to your problem, then I would recommend you repost the question in a more elaborative way so that we can understand and provide all the information required.

I hope this answer gave you some perspective. Have a great day!