Can I look at activities under a curriculum different than the one my school uses?

You can change the curriculum in your settings. However, you will not be provided with additional activities. Changing the curriculum will simply change the way that your class activities are ordered and organized. 

To change the curriculum click on the ‘Class Management’ tab and then select 'Manage My Classes'.

Click on the 3 dots that appear on the right of your class, and select the 'Manage Class Details' option.

Click the 'Advanced settings' option and choose your curriculum from the list.