Dear Praveen,

After completing your diploma in mechanical engineering you can go for various short term courses to get good job. Courses are available for 6 months, 1 year and 2 year.

You can also go for B.E/B.Tech programme. 

There is job options available as well after your course. You can work in government and private sector as junior level but it is recommended to complete your higher studies first then you can go for better job.

All the Best!!