Diploma

SK DAV Government Polytechnic, Government College Of Engineering and Government Polytechnic Balasore.

It is a good decision to take admission in B.Tech after completing your Diploma in engineering. You can join B.Tech course (regular or distance) by D2D process as you have Diploma in engineering. B.Tech programme allows Diploma students to take entry directly into second year of engineering course.
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Dear Ramakrishna,
Yes, it's a good choice to do Diploma engineering but I would suggest you to choose either mechanical or electrical engineering but if you want to study further then you can take computer science engineering. But if you want to go in govt. sector after Diploma, you can choose elect

Dear Shubham,
Along with MBA courses, if there is any possibility you can learn business analytics course or SAP course or digital marketing course that would be helpful.
All the best.

Flight dispatcher course is suitable for flight dispatcher job, but you have to analyse the job opportunity. As far as India is concerned, job vacancy is less.

No, it's not mandatory.