Engineering Scope

Tata, Mahindra, Reliance, Lohia, Torrent, Thermal, Godrej, Larsen Turbo, Kirlosker, General Motar, Siemens, etc.

There is a wide scope of mechanical engineering in Manufacturing industries, aerospace and automotive industries, gov't organizations, PWD and, defense sector as they seek mechanical engineers and also offer a good salary with handsome growth opportunities to B.Tech graduates.

Yes, He/She is eligible for Bachelor of education.
https://www.shiksha.com/teaching-education/colleges/b-ed-colleges-india
Here is the list of the B.Ed college in India

Now, as you are a DMLT degree holder which stands for Diploma in Medical Laboratory Technology and is equivalent to a higher secondary school degree with PCB, so you are eligible for pursuing the MBBS course.

Manufacturing sector is improving day by day and so is the future of this branch. India is focusing on manufacturing sector a lot. There are many colleges in Chennai that provide manufacturing courses but the dedicated college is IIITDM Kanchipuram. You can also go for private colleges like VIT, SRM, etc. MIT Madras also provides this course.

Metallurgical Engineering - Metallurgical Engineering is an important branch of engineering that deals with the study of the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their alloys. Physical metallurgy needs problem solving skills.

Yes, you can be eligible for GME course at GEIMS, if meeting the below eligibility criteria.
1. Educational qualification : Graduation in BE (Mechanical) Engineering / Naval Architecture
2. Percentage required : Minimum marks of 50% in final year and with Minimum 50% marks in English language at 10th OR 12th OR in Degree Exam.
3. Age : Not more than 28 years (as on course commencement date).

Dear Pujan
Future of automobile engineering is very good. With the increasing innovation in electric vehicles, demand of engineer and designer has increased.