hi,

you can make an application to the head of the institutions or hod of your department. or you can contact with the exam cell authorities of the respective college to cancel your name from registered students. however please do think what will you do next, because when you left a course after not completing it it is counted as gap of year, and in future you need to give proper reason for this gap of year. however it will be a good decision to left the course if you get no interest in it.

so best of luck for your future endeavor.