Mechanical Engineering

There are opportunities that you do not need a GATE score to get into an M.Tech course in Institutes like IIT and NIT.
If you are a student of a central-funded university having CGPA of 8. Then, there is no need of GATE score for you. You can avail direct interview for M.Tech in IITs.
If you are among top 10 students at university level.no need for GATE score.
If you do have teaching (or any other in the field) experience of 2 years after B.Tech, then also no need for GATE score even for M.Tech/PhD/MS(research)programs in IITs.
If you are a sponsored candidate (i.e if your employer sponsors your education) no need of GATE score for you.
Some options for you:
M.Tech/ ME in Design/ Fluid Mechanics/ Gas Dynamics/ Production/ Robotics/ Mechatronics/ CAD-CAE etc.
PhD in Mechanical Engineering followed by post-doctoral studies
PGDBM/MBA - from Ivy League colleges
M.Sc in statistics
Any certificate course in Quality Management
Learn a few software like Ansys, Fluent, CFX, SolidWorks etc.
There are many good institutes which conduct their own exam such as BITS, VIT etc.

Hello Surendra,
M.Tech:
This is the course that most students pursue once they complete their engineering. This course has many takers because of the job opportunities that it has to offer. If you really want that edge over B Tech grads or you have set your eyes on becoming a lecturer, this course is highly recommended. The course is two years long and the demand for M Tech grads isnt going to die any soon.
M.Sc. or M.S.
Engineering graduates are eligible to pursue relevant Masters Degree in Science. M.Sc. or M.S. programs can be pursued by them. The key is to select a relevant and rewarding field of specialization. It will also help one take a step towards a rewarding career in the R&D sector!
Branch specific Skills Oriented courses
There exist many technical and skill based courses, which engineering graduates may pursue. Such courses are branch-specific in nature. For example, wiring engineering will suit mechanical and electrical engineering graduates. Similarly, piping engineering will suit civil and mechanical engineering graduates. Such courses are job oriented and will certainly add to the skill set of engineering graduates. Apart from that, such courses are short term in nature.
MBA:
Many companies are looking for engineers with great management skills. If you get an MBA after your B Tech, your value rises exponentially. There is no need to hurry and enroll for an MBA soon after B Tech. You may take up a job, prepare for MBA entrance at the same time and enroll after a couple of years. In this way you have three advantages: you have B Tech degree, work experience and an MBA degree by the time you finish Management course.
PGDM:
For those who are not interested in MBA, PGDM course will come handy. It is a PG Diploma course related to management studies. One may opt for general management studies or may even choose a specialization! PGDM programs are generally around 1-2 years.
Various Software Courses:
This will be helpful to Computer engineering and IT engineering students. The key is to stay up-to-date. There are various private institutes offering software and hardware courses.
Apart from the above mentioned courses, you may even prepare for competitive exams like GATE, UPSC as well as State-wise PSC exams. Many well known PSUs are recruiting GET (Engineering Trainees) through GATE score. A good score in the exam will help you land a good Government job! State-wise PSCs can be used to obtain state Government jobs.