Hello Chandra,

For admission in Jadavpur University, architecture department WBJEE GMR(General Merit Rank ) is necessary along with qualification in NATA. That means only NATA score is not enough for admission in B.Arch, you must appear or have had appeared in WBJEE and secured a good rank. FYI last year i.e. for 2015 opening and closing ranks for the general category were 861 and 4767 respectively. And check the last year's cutoff on the official website of WBJEE.

Hope it helps.