Start each task of an usability test in the homepage of the system?

I need to do some usability tests but Im with a doubt.

I have 5 tasks for the participants of the test execute in a system that has an administrative panel for users insert posts but also there is a front end where the user can access his inserted posts, edit his account, etc.

Is ok to start each test in the homepage of the system? Because if the test starts in some page that already turns the task mor easy to the participant maybe the test is not so effective. And like that starting always maybe is better to test if the navigation of the system is good. Do you know if start each test in the homepage of the system is correct or there is some more correct way to do the test?