hii amena 

as you know that every year cut-off marks chances and with respect to that your rank also chances so it will be difficult to tell you the exact marks for which you will get 40000 rank but on an average you have to score above 440 marks to get 40000 rank.

now if you are aiming for government bds college and you belong to a general category then you should score above 470 marks for 85% state quota seats and above 500 marks for 15% all india quota seats while for obc it will be above 450 marks under 85% state quota seats and above 480 marks under 15% all india quota seats.i hope this information helps you.

thank you