If you are a fresher, most recruiting companies will look for academic consistency. Also, many recruiters set a condition of a minimum of 60% in academics for shortlisting students. So, to improve your CV you have the following options.

• If you are taking Finance, enroll yourself in extra certifications like CFA.
• Participate and try to win competitions organized by companies like Asian Paint’s ‘Canvas’, JP Morgan’s ‘The Deal’, GE’s ‘Genious’, ITC’s ‘Interrobang’, Tata Steel’s ‘Steelothon’, Mahindra’s ‘War Room’, etc.

These competitions are very tough as many students from top B-schools take part in them. But if you manage to win, you will get a Pre Placement Offer (PPO) with a CTC of around 15 LPA. 

Work on your communication skills, recruiters look for students with good communication skills. 

For admission, you don’t need to worry about your 12th score, since there is no such minimum cutoff for it at SIBM Bangalore. But make sure you work on your CV to secure good placements.