A customer just pointed it out to us and we immediately addressed it:

The newer version of The Official ACT Prep Guide (ISBN 1119386896) is slightly different from The Official ACT Prep Guide (2016/2017) ( ISBN 1119225418).

The difference is in practice test #1, Math, Question 59.

The questions are both dealing with Triangles, but they are different and so is the correct answer.

Please check which version of the test your students are taking and use the correct key ID to correctly grade those tests.

When grading Test #1 from the current version of the red book use key/test ID 62. When grading Test #1 from the old (2016/2017) version of the red book, use key/test ID 33.

All keys are accessible as system keys through your admin panel in OnlineScoreTracker.com. By default new system keys are inactive. Just click on the ‘inactive’ status to toggle it to ‘active’.