performance

hi friends

pls help me in this by tuning this query



SELECT (SELECT NAME FROM OFFICE_MASTER WHERE RECORD_STATUS=1 AND ID=C.OFFICE_ID) AS SECNAME, C.OFFICE_ID,COUNT(C.ID) AS TOTAL,COUNT(BP.CONS_NUM) AS COMPARED_CONSUMERS
FROM CONSUMER_MASTER C,BILL_DETAILS_T B,BILL_PROCESS_T BP
WHERE C.ID = B.CONS_NUM AND BP.CONS_NUM(+)=B.CONS_NUM
AND TRUNC(B.BLISSUE_DT) BETWEEN TO_DATE('03-JUN-2013','DD-MON-RRRR') AND TO_DATE('10-JUN-2013','DD-MON-RRRR')
AND BP.BILLMONTH(+)=B.BILLMONTH AND BP.BILLYEAR(+)=B.BILLYEAR
AND C.RECORD_STATUS=1 AND B.RECORD_STATUS=1 AND BP.RECORD_STATUS(+)=1
AND B.BILL_TYPE='SBM'
GROUP BY C.OFFICE_ID