MBA/PGDM

some average level institutes accepted students for MBA ,but most of the institute need at least 50% or more., choose some tier 2 level institutes

1. T.I.M.E.
2. BULLS EYE, etc.

You can refer to the below mentioned link:
https://www.shiksha.com/7-jobs-that-pay-you-to-travel-across-the-world-article-4224-1

You require minimum 50% in graduation.

Dear Mr. Chandra Sekhar,
Since, you are already aware of your weakness, my recommendation would be to first work to improve this aspect before taking the CAT. In recent years, weightage to the verbal and reading comprehension section has increased indicating that the examiners are really looking for

Yes you can do BBA.

There is no need of degree. With 6 years of experience he is eligible for executive MBA. Ask your friend to complete his B.Tech. There is no need of MBA, to become a manager in the technical field.

Yes, you are eligible to do that from India.