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