Colleges in Gujarat

It starts in the first week of May.

68 percentile is low. Apply through CMAT scores.

The college closes its cut-off around 95%ile for general category. It is difficult to get admission.

Chance are good. It generally closes its cut-off around 95%ile.

Chances are low. Go for other colleges or study hard and appear next year

Almost, 80% students of batch 2016-18 have been placed, rest will be placed within this month (saying this on the basis of last year's record).
Also, I would like to tell you that SBS has maintained the reputation of providing placements to 100% students till now.

No. you cannot. This is because courses available at Shanti Business School are PGDM and PGDM-C. Both are postgraduate Diploma and the minimum level of qualification required to pursue PG is graduation.
You can complete your graduation from any other institute and for PGDM, you can come to SBS.

There are over 10 MBA colleges in Vadodara (Formerly known as Baroda). Please refer to the link provided below for a list of these colleges. You should be able to navigate to a college of your choice using the filters on the web page:
https://www.shiksha.com/mba/colleges/mba-colleges-vadodara

Yes, it gives admission based on your class 12th score. You can see cut-off in the book provided by ACPC.