Aeronautical Engineering

It is easy to pick up mechanical engineering for Avionics engineers, vice versa may not be true. With sophistication & development in avionics - I prefer avionics.

Aeronautical engineering is an inter disciplinary branch. You can specialize in AE at M.Tech level by appearing for GATE after B.Tech.

AME is a niche branch of engineering in whichever you are only eligible for aircraft servicing and maintenance jobs. You will get very little aircraft design exposure. Scope is limited to a smaller industry. Aeronautical engineering has wider scope. Therefore, it will better if you do aeronautical engineering in place of AME.

Yes, you can pursue BE in any branch after completing Diploma, but you will get admission in the first year. If you opt for B.E in the same branch or similar branch then you can get admission in the second year.

Indian Institute of Aeronautical Engineering and Information Technology (IIAET) is the best college in Pune for aeronautical engineering.

Please mention the level of the course - do you wish to pursue the course for an undergraduate degree or a postgraduate degree?

Germany is the best choice if you are looking for quality education in a reasonable cost. Tuition fee is very low and they charge only semester fees. Living expenses are low as well.

Yes, you can. Narrow down your college choices, check what they require, check the fees, make sure you meet admission requirements. Take the SAT if you plan to study in US. Prepare for IELTS or TOEFL, you must demonstrate English language proficiency to study abroad.
Regards

If you think hard that's will be hard for you. if you think in your mind that I can do, here's nothing that you can't to do.