Have you read every question/statement thoroughly?
If you haven't just try reading through it again.
If you have I suggest reporting it to an Admin as a website bug.
There's one question meant to trip you up to make sure you read them all instead of clicking yes to everything. You should have one different from the others so read them all again. If you still don't pass, talk to the admin because there's a bug.
The chatter test is a quiz that you take before being allowed to use the full screen or web cam chatter and all questions must be answered correctly to be able to use the chatter.