I completed and received a certificate for level 4 and I simply don't remember how ! I can't find level 5 test. Am I supposed to complete all lesson quizzes first in order to access it? Please help, Thank you.

你好Omar, you just go to the course overview in which you can see all levels. There you have a button "Got to Level Quiz". You get there through the "Course Index" which can be found by clicking on your profile picture => Course Index => "Fluency Path View Details" => "Level 5 Go to Level Quiz" Usually the quiz should come up automatically after viewing the last story time of each level though.