M.Tech

M.Tech is for design and teaching careers. For construction careers, B.Tech is sufficient for any company.

You can visit the below mentioned link for detailed information: https://www.shiksha.com/university/noida-international-university-greater-noida-53337/courses/me-mtech-bc

You can check the below mentioned link:
https://www.shiksha.com/college/dy-patil-school-of-engineering-dypsoe-lohegaon-pune-40764

Yes, you can take admission in BHU, Varanasi for this course.

It depends on your own interest. You can go for M.Tech in production and design.

You can go for MBA and you will find better options further.

Hi
You can pursue B.Tech immediately after your completing your 12th and giving the common entrance test for admissions. As Mr. Sunil Soni said, BE and B.Tech is the same degree. It depends on the college you select. You can apply to the various colleges like:
1. BITS, Pilani
2. IIT's
3. UPES, Dehradun
4. Vellore institute of technology, Tamil Nadu

Dear Pravesh Kumar,
For MBA admission, they need GMAT and TOEFL. For M.Tech, GRE or TOEFL scores are required along with the sponsorship letters.
All the best.

Yes, you can do both the things simultaneously.