Sometimes for general practices or to demonstrate something we need some sample Oracle schema. And the most used sample schema is Scott because most examples are given for this schema. You can download Oracle Scott schema script from the below link.
You can also find Scott schema script on your system if you already installed Oracle database. Find at the below location:
ORACLE_HOME\dbhome_1\RDBMS\ADMIN
Where ORACLE_HOME is the Oracle database installation home directory.