Dear Kavya, 

The online option entry for Karnataka will begin after document verification. To be able to list your preference for the colleges and course in Karnataka, you will be able to do it by signing in through your User Id and password (Given at the time of verification of documents) at Student Login portal. 

The link to student login page can be found on the KEA NEET UG 2018 website. You can find the link of the website and all other details in the article given below. 

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Karnataka MBBS 2018 Admission Details

Hope it answers. 

All the best!