What will be the marks vs rank in WBJEE 2020 ?
We do not have brand-new data but you can take help of previous year record which can give you an expected idea for comming record.
199-170: 10-50
170- 150: 50-100
150-120:100-200
120-100: 200-700
90-100 :700-1200
70-90 : 1200-3800
60-70:4000-6000
50-60:6000-10000
40-50:10000-17000
34-40:17000-25000
<34 : >250000
Along with this you can also use the below link and can predict your rank using your marks.
Best of luck.