Hello Prashant,

Now a days there are number of institutes which provide training for Mechanical Engineering Students, You can prefer given below.

CRB tech 

CAD CAM guru

MIT Skills

If you are planning to build a career as a Design Engineer, You need to be a little more specific in what subdomain you are going, You can go for the Design Courses-

Autocad 2D and 3D - used for drafting and Detailing.

Autodesk Inventor - This software is used for 2D modelling, 3D modelling as well as for Analysis.

Creo parametric - used for 3D Part Designing and Assemblies.

Solidworks - Used for critical designing and Assemblies.

Catia - Used for aerospace automotives and heavy machineries Designing.

Siemens Nx - It possess features like Part Modelling, Assembly, Surfacing, Drafting, Animation, Rendering, Simulation and Analysis.

It depends on your interest.

Good Luck!