Student info or a list of students that are in a specific tier can be exported from the Students page: 

Using the available filters, you can drill down to see a specific subset of students. For example, in order to export a list of students that are tier 3 in Math, adjust the Topic filter to include Math, and check off the Tier 3 option under the tiers filter: 

After applying the filters, the resulting Students page will only include students satisfying those filters. From there, you can click on specific student names, or choose Select All

From the Actions menu, select "Export Student Data". This will download a CSV file that users can then use for further reporting. 

Example of Export:

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