When adding module requirements, you can specify that students must move through module items in the order they are listed on the Modules page. This option means that students must complete one module item before they can progress to the next item in the module.
Note: You can only allow students to move through a module if you have added module requirements.
In Course Navigation, click the Modules link.
Locate the name of the module and click the Settings icon . Select the Edit link .
Require Sequential Order
Under the module requirements, click the Students must move through requirements in sequential order checkbox.
Note: The Students must move through requirements in sequential order checkbox will not be shown if the Students must complete one of these requirements radio button is selected.
Click the Update Module button.