Exam

The eligibility criteria for getting admission in SIESCOMS is:-
1.Candidate must be a graduate in any discipline from a recognized university with minimum of 50% marks.
2.Valid CAT/ CMAT / ATMA / MAT / MH-CET / XAT score.
So you are eligible.I think to finally secure your seat you must get score of 80

If you gets placed through open camps/on-campus placement, then working for 1/2 year before option for MBA is a good option. Although your academic profile is good, you can attempt CAT this year and try to score 95 percentile. Pursuing MBA from any of top 15 B-Schools is worth. So you if you have op

No, from this year, your board marks won't have any weightage. Although, to appear for JEE Mains exam, you need to score above 75 percent marks in HSC.

In order to advice you, you are requested to share your subjects in 10+2 stage and your areas of interest.

You have good chances to convert but your graduation percentage is on the lower side. Still if you perform well in GD/PI, then you have good chances to convert. As B-Schools give weightage to GD/PI-WAT/PI rounds.

You can check for IMI-Kolkata/Bhubaneshwar, ISME-Bangalore, VIT, BIMM-Pune, Amrita, IIFM, BIMTECH-Noida, SIES, ITM-Mumbai, SCMS-Cochin. You can consider these colleges.

You need to score more than 30 marks in GATE exam to get admission in CIPET.

It is better for you to read The Hindu newspaper daily as it is considered to be the best medium for studying current affairs.

Yes, you can appear for CAT exam after completing B.Com.