Corrections
Every correction made after release to a question, an answer, an explanation, a source or a figure is listed here, with its date.
No corrections since release: the course has not been released yet.
Before the first release
Every question cites the federal source it was written from, and was checked against it in a separate pass from the one that wrote it. Those checks led to 130 edits to questions and figures before the first release. None of them changed which answer is marked correct. Most were improvements, not errors: wrong choices reworded so that the right one does not stand out, citations narrowed to the exact paragraph, drawing labels enlarged for a phone.
Report a problem
If you think a question, an answer, an explanation or a figure is wrong, “Report a problem with this question” in the app opens an email in your own mail app. You can also write to [email protected] with the question's number or its wording. Every report is checked against the federal source.
Question bank now: version 2026.10.10, 831 questions.