Congratulations for your result. You know the cutoffs change every year based on various factors. But going by last few years' data, it will be quite difficult to get Computer Science or Information Technology in IEM. As the closing rank for CS lies around 1700 for general category and 3100 for Information Technology after round 3 of counselling. In Heritage Institute of Technology, last year the closing rank for CSE was around 3434. And for Information Technology, it was around 4254. But the cutoffs change every year. You can look for CSE in other private Engineering colleges like Techno India College of Technology, Techno India main campus also. Use your WBJEE College Predictor tool to know where you have good chances
http://www.careers360.com/wbjee-college-predictor