Hello,
Usually there is no reservation for BPL candidates in any entrance exam or admissions. So it is adviced to go with EWS quota.
However if BPL reservations is available in any admission process, alnog with EWS, then you need to opt for either of them. You can not avail reservations under both categories at the same time.
It is advisable to look into the guidelines and select appropriate quota.

Good luck