Hi, 

In order to seek admission through the 85% state quota, you need to furnish the domicile certificate of that state at the time of admission then only you will be eligible for state quota otherwise you will be treated in All India category. 

Every state has different rules and regulations for providing domicile certificate, the rules for Karnataka state are as follows, please visit the following link. 

http://domicilecertificate.in/process-to-avail-residence-domicile-certificate-in-karnataka/

Thank You !!!