You have already completed a polytechnic diploma and are in an industrial job. Now you want to enhance your academic or technical qualifications for improving your career further in the same industrial unit or some other organisation.
This is a point at which a decision is to be taken for the stream you want to go ahead and in this context I want to say that you must identify your area of interest. From your resume it appears that you might be interested in a technical qualification but there are many other options which you can consider at this juncture.
The foremost option in correspondence mode is going for AMIE but that is not the end. If you have interest in commerce, you can think of doing B.Com. after which you can try for many jobs in the industrial, commercial and business arena. If you have interest in science or humanities and want to explore the area of teaching then there are opportunities to do so after B.Sc./ B.A. and then B.Ed. There is another line that is computer science and if it fascinates you then you can do B.Sc. in computer science followed by some course in prospective fields like web designing, system management, data base etc. If you are good in studies then there is another option that after the graduation you can appear for so many competitive exams where if you compete you can carve out a very good career for yourself. These competitions are held in the areas of banking, state services, subordinate services, Railway services, defence services etc. So, you have to assess your capabilities and capacities vis-a-vis the various career making streams in our country.
Once you acquire additional qualifications you will have opportunity to join some start up groups or start at your own some business which has a potential for growth and slowly you can expand your work. We generally think for some job but today the job conditions in our country is not good. There are few jobs and many contenders. So, those who have innovative ideas and will to work hard can venture in the business areas and soon can be a self employed person. So work hard and keep your eyes open for such opportunities whenever come your way.
Please note that sometimes we feel that the grass is greener at the other side of fence but it might be an illusion. So, one should also explore the possibilities of going up in ones present organisation after acquiring additional qualifications. Sometimes there are good breaks people get there itself.
Knowledge is power.