Take the test Prerequisite Unit 3 below 

You need a score of 80% or better to start Unit 3
If your score is below 55%, we encourage you to do (or review) Unit 2 before starting Unit 3 in order to consolidate your basics.
If your score is between 55% and 80%, Please take the test again. Feel free to go back to Unit 2 to review some lessons to ensure a pass next time!

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