Dual

You have a lot of option like can go for research or in any MNC.

One sitting exam is not considered valid for integrated economics course.

If you opt for an integrated programme you cannot pursue a similar programme from another college in the duration of the integrated programme. Only after the completion of BBA+MBA, you can go for a separate MBA course. But why do want to opt for an integrated programme and waste time and effort if you are going to opt for an individual MBA anyway? Make your choice wisely.

Yes, you can mostly.

Yes, almost surely.

1st phase of admission process got over on 31st May, 2018. Details of 2nd phase are as follows:
* Filling up of application for admission (2nd Phase of Admission)
01.06.2018 to 30.06.2018
* Downloading of Admit Card for written test of 2nd Phase of Admission
04.07.2018 to 11.07.2018
* Written Test
15.07.2018 to 19.07.2018
* Period of Publication of selected candidates of 2nd Phase Admission
16.07.2018 to 21.07.2018
* Admission of 2nd Phase based on the merit list
16.07.2018 to 31.07.2018
* Display of position of vacant seats in Sambalpur University website
01.08.2018

Yes, you are eligible to apply. For further details visit: https://www.shiksha.com/science/course/integrated-b-sc-b-ed-assam-university-silchar-173910

Hi Farnaz,
All the online rank predictors are based on the cutoff marks provided by BITS last year. So I guess they are reliable.
However, for more clarity, you can check the last year official cutoff scores published by BITS at http://bitsadmission.com/cutoffscores2017.aspx
Best wishes.

Which state/country are you looking for? Also, can you give details about your grades till now, that would help us suggest you relevant colleges.