Hey Radhika, 

I guess you are not clear with your question. 

If you are asking about the institutes for BCA here is a list of them:

• SRM University Kattankulathur
• GLS Institute of Computer Application
• Xavier's Institute of Computer Application
• Institute of Management Studies - [IMS]
• Chandigarh Business School of Administration - [CBSA]
• Vivekananda Institute of Professional Studies - [VIPS]

There are many institutes in West Bengal also 

• Techno India University
• Heritage Institute of Technology 
• Asansol Engineering College 
• Future Institute of Engineering and Management 
• George College
• Netaji Subhash Engineering College 
• Meghnad Saha Institute of Technology 

The admissions have already started in many colleges. There are direct admissions and also admissions by entrance exam, after which you will be directed to a counseling process.The online applications has been started

Regarding B.Tech CS,it a engineering degree in the field of computer sciences.BCA and B.Tech are completely different courses with differences in study matter and other aspects also.

Regards.