Hey Rupam !

With 45 marks in WBJEE ,you can expect your rank to be around 7100 -7500. This predicted rank is on the basis of previous year cutoff trends and so its just a prediction.Also , you can predict the list of colleges you can get with this rank , just by using WBJEE COLLEGE PREDICTOR TOOL.Here's the link for the same:

https://www.careers360.com/wbjee-college-predictor

Hope it helps!