According to past trends, for general category an opening WBJEE rank would be around 519 and closing rank would be 2699 for B.Arch course.

NATA gives equal i.e., fifty fity percent weightage to plus two and entrance score for admission to various colleges for B. Arch course. A score of around 130+ in entrance  would be great to get admission in JU. 

You can also get B. Arch course through JEE Main paper 2 in Jadavpur University.