M.Tech

If you want to acquire thorough technical and practical knowledge of a subject, then opt for M.Tech otherwise, opt for M.Sc. M.Sc has more focus on theory than the practical aspect of a subject. Choose your stream as per the nature of the job you want to get.

Apart from IITs (Kanpur, Roorkee and Guwahati), NIT Warnagal, NSIT Delhi, Thapar University, Manipal Institute of Technology, Karnataka, Vellore Institute of Technology (VIT); and Sir M. Visvesvaraya Institute of Technology, you may check at the following link:
https://www.shiksha.com/top-bio-technol

As you have already completed your M.Tech, I would recommend you to start your job and take practical experience and then if you wish to study further along with your job, then you can opt for E-learning courses.

You should appear for two exams - GRE and TOEFL ,then you can apply for the preferred university, but after your M.Tech, you are eligible for Ph.D, so go for that ,don't waste your time and money.

Usually, people prefer doing M.Tech after completing their graduation in B.Tech, but there are lot many options other than M.Tech that you can pursue. You can go for a MBA or M.Des.
Go for a MBA, if you are looking to get into the management stream. You can always choose a specialisation in MBA or el