Distance/Correspondence

First, you need a Bachelor's degree and then you have to clear an entrance exam like CAT, MAT, GMAT, CMAT, XAT, etc. Anyone of them which is accepted by the college you want to get into. Or, you can go for distance MBA, as it doesn't require entrance test for admission. You must study hard and score

Yes, you can apply for B.Ed. The eligibility is to have completed graduation/ post-graduation from a recognized university with minimum 50% marks (47.5% for SC/ ST/ Blind/ Physically Handicapped candidate) or must have completed BE/ B.Tech from a recognized university with minimum 55% marks (52.25%

As per government norms (Distance Education Bureau (DEB) can't be provided by institutes any more. None of the institution got approval from DEB in 2017-18 session. Better go for a MBA from a deb recognised university.

As per AICTE norms, BE can't be done through distance education.

Yes,
TNOU provide a Certificate programme in food and nutrition via correspondence. Please refer to the link provided below for further details regarding this course, admission process, eligibility etc.
https://www.shiksha.com/medicine-health-sciences/dietics-nutrition/course/certificate-program-in-f

If you have already done MBA, then there is no use of doing it. And we take admission on graduation basis, not on post graduation bases.

The basic requirement for pursuing a B.Tech degree in civil engineering through distance education is that the aspirant should have passed his 10+2 standard with a minimum aggregate of 45%. The Diploma holders can also apply for the same. Many colleges in India offer the aspirants with distance educ

Which college are you planning to take admission? You can apply for B.Ed after completing your BA. The fees vary from institute to institute.