Hi try man ....
here is the correct format...

1 2 3 4 5 6
30 00 * * 1-4 /home/oracle/test.sh

45 01 * * 5 /home/oracle/test1.sh

1.....min
2.....hrs
3.....day of the month
4.....month of the year
5.....day of the week
6......script.
Hope this help.
Thanigaivasan