Test condition can be precondition and post condition of 
the test cases. Precondition is the steps taht has to be 
carried out before executing a test case and Post condition 
is response of the test case been exceuted like expected 
results.

Testscenario is a combination of testcases for a particular 
functionality like example login scenario. In login 
scenario we will be checking for valid username and 
password, invalid username and password, valid username and 
invalid password and invalid username and valid password.

Please let me know if im wrong