Our Account & Settings page includes a few options that will allow you to very quickly "Change all Urgent to Current" and/or "Change all Current to Past" topics, which we'd recommend you do at the end of a curricular unit or block.
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Via the Study Something Specific page, you can hit the banner icon next to any subject branch name to mark or unmark the entire subject branch. Alternatively, using the "Manage Marks" button on the Study Something Specific page will allow you to "Change All" for any topics if you'd like to broadly sweep a new topic mark across a vast breadth of content.