What should be your raw score in CET is to get into JBIMS?

There is no fixed CET score that will guarantee your admission to JBIMS. The raw score keeps changing from 120-165+. It actually depends on the level of difficulty of the paper during the particular year. Sometimes the paper is quite difficult and the highest score is just around 130. Other times the paper was so easy that even a 165 did not guarantee admission.

Many people suggest targeting 150. But I personally feel it hampers the entire process as you are under pressure and then flunk the paper terribly. One should focus on solving the paper rather than targeting a specific score. Your high target will refrain you from attempting the paper to your fullest potential. 

Know that if the exam is tough it is so for everyone, and if it is easy it is so for everyone. So unnecessary stressing yourself will do you no good in the end.