Custom Top Creation:

Below is good link for Custom Top Creation.

http://www.appsdba.info/docs/oracle_apps/sysadmin/R12/CREATECUSTOMTOPINR12.pdf

Oracle Dumps for Certification

Below is the link for dumps for Practicing

https://www.logicsmeet.com/dumps/Oracle.aspx

How to download Work flow in Unix Box

Go to temp folder

Run below command for downloading workflow by passing user details along with work flow name.
 

WFLOAD apps/oradb9i 0 Y DOWNLOAD OEOH.wft OEOH