Which course should I pursue after completing +2 science to get a management job in private sector?

BBA is the course you should choose to get into managerial role. After that you can pursue MBA from a top B-School to enhance your skills and get into a good job in private sector.

You should opt for BBA or BMS in UG. After completing your graduation, you should pursue MBA. You can opt for MBA in HR, aviation, finance, etc.