What are the courses of 6/12 months I can pursue after my B Tech in Mechanical Engineering?

I suggest that apart from learning AutoCAD (also rightly suggested by @Ravi Rai), which is very handful for mechanical engineers, you should opt for a good training in the filed in which you want to make your career. Shop-floor practical training in machine / equipment design & fabrication would be

Hi Piyali............ firstly I just wanna know dat in which year u r pursuing right now..??? U can go for doing CAD courses like Autocad Pro E Solidworks Catia etc. as these course r in demand and best job for all..................U can contact me for furthur assistance and free counselling via ema