'karmakar' and 'kamar' in obc list

In response to your query,

OBC is a collective term used by the Government of India to classify castes which are educationally or socially disadvantaged. It is one of several official classifications of the population of India, along with General Class, Scheduled Castes and Scheduled Tribes (SCs and STs). The Kamar or Kamara is an Indian caste found in the Odisha states of India. They are sub-caste of Karmakar caste of Bengal which are categorized as OBC in West Bengal.

The economically weaker section (EWS) is the section of the society in India that belongs to the un-reserved category and has an annual family income of less than 8 lakh rupees. This category includes people that do not belong to the caste categories of ST/SC/OBC who already enjoy the benefits of reservation.

As you can see that the Kamar community is recognised by the state of West Bengal therefore the central government cannot overview the recognition of a state so you won't have any problem at the central institution. 

But in your case I would suggest you to go with EWS eligibility as that will be more beneficial to you in a central institution written exam.

Regards,

Aryan Raj