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Here is a list of some colleges or universities offering B.Tech in Bio Technology in Tamil Nadu:
A.R.J. College of Engineering and Technology, Mannargudi, Tiruvarur
Aarupadai Veedu Institute of Technology, Chennai
Adhiyamaan College of Engineering, Hosur, Krishnagiri
Arulmigu Meenakshi Amman College of Engineering, Cheyyar, Tiruvanamalai
Arunai Engineering College, Mathur, Tiruvanamalai
Bannari Amman Institute of Technology, Sathyamangalam, Erode
Dr. MGR University (Dr. M.G.R. Educational and Research Insitute), Chennai
Government College of Technology, Coimbatore
Jeppiaar Engineering College, Sholinganallur, Chennai
K.S. Rangasamy College of Technology, Namakkal
Kalasalingam University, Virudhunagar
Kamaraj College of Engineering and Technology, Madurai
Karpaga Vinayaga College of Engineering and Technology, Kanchipuram
Karunya University (Karunya Institute of Technology), Coimbatore
Kumaraguru College of Technology, Coimbatore
Madha Engineering College, Chennai
National Institute of Technology, Trichy
P.S.R. Engineering College, Sivakasi, Virudhunagar
Paventhar Bharathidasan College of Engineering and Technology, Trichy
Prathyusha Institute of Technology and Management, Tiruvallur
PRIST University (P.R. Engineering College), Thanjavur
Rajalakshmi Engineering College, Sriperambudur, Kanchipuram
SASTRA University, Thanjavur
Sathyabama University, Chennai
Shri Andal Alagar College of Engineering, Kanchipuram
Sri Nandhanam College of Engineering and Technology, Vellore
Sri Venkateswara College of Engineering, Sriperambudur, Kanchipuram
St. Joseph's College of Engineering, Kanchipuram
St. Michael College of Engineering and Technology, Sivagangai
Udaya School of Engineering, KanyakumariAnna University campuses
Vel Tech High Tech Dr. Rangarajan Dr.Sakunthala Engineering College, Chennai
Vinayaka Mission's Kirupanada Variyar Engineering College, Salem
VIT University (Vellore Institute of Technology), Vellore
Vivekanadha College of Engineering for Women, Tiruchengode, Namakkal

Both are good.
PGDM is an institute autonomous program which is approved by AICTE.
MBA is a program which is affiliated to a university.
Colleges which offer AICTE approved courses will also offer PGDM, not MBA, for example, XYZ College is affiliated to ABC University, they offer MBA course affiliated to that university, the same college is offering AICTE approved the course, it means they are offering PGDM which is not linked to ABC University.
Typically, if any PGDM is to be equivalent to MBA then the course duration should be 2 years, a 1-year PGDM will not be equal to MBA course.
Even IIMs, XLRIs doesn't offer MBA degree, they only give PGP Diploma or PGDM since they are autonomous and independent bodies.
Always see the college reputation and placement instead of MBA and PGDM program.

It depends on where you wish to see yourself after the completion of the course, as a cyber security professional or in automobile/ mechatronics/ robotics or even IT industry. Mechatronics engineering is multidisciplinary comprising of streams from electrical, electronics, mechanical and computer engineering that serves the very purpose of control of hybrid systems. Any computer connected to the internet is vulnerable to cyber-attacks. Cyber security is the technique used to protect computers and networks from these types of intrusions. Cyber security experts are one of the most sought after professionals in the technical sector considering the trend in cyber-attacks all over the world.

Hello Abdul,
you have good chances only to get admission at Sastra University, Thanjavur.
You might also get ECE and mechanical. You need to apply through stream 2 if you have not appeared for JEE Mains exam.
Those who have appeared for JEE they can apply through stream 1 in stream 1, 70% seats are filled and in stream 2 30% seats are filled.
So, I think you can get admission through stream 2 as you have really good percentage. Your total percentage out of 100 is only considered and not your marks in main subjects like physics, chemistry and maths/biology
the official website to apply for sastra university is www.sastra.edu and the last date is June 10.
All the best!