With your rank it may be a little difficult to get a government college for computer science but you can definitely check out some colleges under WBUT which have a good reputation for CSE like

• Asansol Engineering college 
• Dr BC Roy college Durgapur 
• BCET Durgapur 
• BP Poddar Institute of Management and Technology 
• Future Institute of Engineering and Management 

These colleges have a pretty decent placements. Companies like TCS, Tech Mahindra and Accenture are the frequent visitors. 

All the best