Hey. 

To be eligible for the 85% State domicile seats of West Bengal you need to fulfil any of the criterias mentioned below-

• You need to have lived continuously for at least A decade in their state of West Bengal.
•  You need to have studied and lived consistently To get a minimum of a decade in their state of West Bengal. You will have to complete Class 12 to match this standard.
• If you  have not resided in the state of West Bengal, however, your parent/sought to really be permanent residents of this state

Hence you cannot be eligible for domicile category only on the basis of competing 11th and 12th from Kolkata you need to fufil any of the above mentioned criteria.

Best of luck!