Look the marks vs rank depends from year to year. So it is very much difficult to make any assumption from now. But all I can say considering you in general quota is you need a rank below 1.2 k(General Merit Rank). With a rank below 1.2 k you can opt for a brach in Jadavpur University for sure.

If you are looking for CSE/ETCE/IT/EE/EIE(Then 150-820).(104-131.5 marks)

Mechanical, Chemical, Production,(850-1400)(90-104 marks)

Civil, Metallurgy (1500-2100) (83-90marks)

Power, Construction, FTBE( 2200-3900)(70-83 marks)

Printing, Pharmaceutical, Architecture (4k-8k) (55-70 marks)