Dear Supriyo,

It is very difficult to predict the cut  off for getting admission in any college as each year the cut off can change due to several factors like:

• Seat Matrix
• Difficulty level of exam
• No of students appeared for the exam

As per previous year cut off(WBJEE 2020) , you have low chances to get CSE/ECE branch in the following Gov colleges after 3rd round :(GEN category)

• Cooch Behar Government Engineering College, Cooch Behar-9671(CSE), 14895(ECE)
• Government College of Engineering and Leather Technology, Kolkata-4931(CSE)
• Govt. College of Engg. & Textile Technology, Berhampore-8637(CSE)
• Govt. College of Engineering & Ceramic Technology, Kolkata-4415(CSE)
• Govt. College of Engineering & Textile Technology, Serampore-5501(CSE)
• Kalyani Government Engineering College, Kalyani, Nadia-1458(CSE) , 2475(ECE)
• Jalpaiguri Government Engineering College,Jalpaiguri-3200(CSE), 5045(ECE)

You can also check the  cut off details from here :

https://admissions.nic.in/wbjeebcouns2019/wbjeebcouns2019/orcr/PrevYearORCR.aspx

Use this WBJEE college predictor for your reference :

https://www.careers360.com/wbjee-college-predictor?utm_source=qna&utm_medium=ini-cet_cp

Hope this helps !