After Diploma in Automobile you may pursue a A.M.I.E Associate Degree in Mechanical Engineering, equivalent to B.Tech from Institution of Engineers.

You will require minimum 4 Semesters (2Years) for completion of AMIE and maximum Duration allowed to complete the course is 6 Years.

For more information about the Institution of Engineers, Kolkata do follow the link below

https://www.careers360.com/colleges/the-institutions-of-engineers-india-kolkata/amp