Queries causing high physical read - oracle database script

SELECT SCHEMA,
       sql_text,
       disk_reads,
       round(cpu, 2)
FROM
  (SELECT s.parsing_schema_name SCHEMA,
                                t.sql_id,
                                t.sql_text,
                                t.disk_reads,
                                t.sorts,
                                t.cpu_time/1000000 cpu,
                                t.rows_processed,
                                t.elapsed_time
   FROM v$sqlstats t
   JOIN v$sql s on(t.sql_id = s.sql_id)
   WHERE parsing_schema_name = 'SCOTT'
   ORDER BY disk_reads DESC)
WHERE rownum <= 5;