How is the placement scenario at IMT Ghaziabad? How difficult is to bag an offer of 15L and above?

The table below will help you get a generalized picture of the IMT Ghaziabad placement 

Coming to the second part of your question, a package of 15 LPA and above is certain for those who have scored the highest percentile only. It’s not possible for B Schools to offer package roles to the entire batch to maintain a high average figure. So before joining a college for MBA you should analyze whether the package you will get will compensate for the hefty fees you pay.