improve my number disk's access read 1M230 to retrieve 465 rows

hello,
    I would like reduce the disk's read i have executed tkprof.

1 - i see tkprof's report and I see disk 1018569 and 1234680 for retrieve 465 rows. and CPU 26.36
how may I improve it ? i suppose that my statistics are correct but I am not sur. How may i control ?
afterwards maybe I can improve by histogramme, how may I to do ?
what do you think about it ? or have an other solution to improve it ?

2 - I see this next and i would understand the signification :
 
  db file scattered read                      99261        0.00          3.90
  db file sequential read                     19442        0.01          0.13

best regards
JP


call     count       cpu    elapsed       disk      query    current        rows