Hi Hatgreenwood,

do you have to get 100% to test out?

Nope, not every question has to be answered correctly to pass, but no more than three questions can be answered incorrectly. When testing out, you should have three hearts, and each answer you get wrong will cause you to lose one heart. If you answer more than three questions incorrectly, you will not be able to pass. :)

Do mean a single lesson or do you mean all the lessons within one topic?