Hi Aspirant!
Diploma in Operation Theatre Technology is a 2 year graduation course and the minimum eligibility is the 10+2 from a recognized board or equivalent exam. The entrance exams taken by reputed institute for admission to this course are as follows:-

• NIMS School of Paramedical Sciences and Technology Entrance Exams.
• Tech Mahindra SMART Academy for Healthcare Entrance Exams.

Some top colleges are:-

• Symbiosis Institute of Health Sciences, Pune.
• Tech Mahindra SMART Academy for Healthcare, Chandigarh and Mohali.
• Shivalik Institute of Paramedical Technology(SIPT), Chandigarh.
• Sumandeep Vidyapeeth University, Vadodara.
• Institute of Para Medical Technology, New Delhi.
  

The salary packages offered for Operation Theater Technicians/Assistant are about Rs 3,00,000 per year.

All the best!