In order to be able to unlock next lecture, you must watch 90% of the video without forwarding and achieved 70% in the quiz.

If you have watched 90% of the lecture without fast forwarding, this may mean that during your session, your internet may have experienced issues so Teachable was not able to track progress.

Usually a browser refresh or clearing browser cache should take care of it. 

Hello Bushra,

I did the steps as you said, cleared the cache and refreshing the browser but unable to unlock the lecture 

https://aviatrix.teachable.com/courses/aviatrix-ace-associate/lectures/15897627

Can you please reset my course, So that i can start from the first lecture ?

https://aviatrix.teachable.com/courses/aviatrix-ace-associate/lectures/16752962