Dear Shiyas 

There are many good colleges which offer BSc in Operation Theatre and Technology (OTT) and most of them conduct basic entrance exams after 10+2 to take admission in this course. Some of the popular and reputed colleges/universities offering this course include Rajiv Gandhi University of Health Sciences (RGUHS), Christian Medical College Vellore, Jamia Hamdard University, among others. If you are seeking a college in a particular state of your interest, please specify.

Coming to your percentage of Class 12. Generally, wherever there are entrance exams, the percentage of Class 12 is considered only as the qualifying marks for Bachelors course. Try to prepare well for respective entrance exams, which will help you subtle the influence of Class 12 marks in the admission process. 

All the best!