Can't go back to a specific exercise!

I already finished the Python course and there are some times that I want to go back to a specific exercise.
But I can’t go back to a specific exercise, it has a lock although I already finished the course.
How to access them?
Thank you!

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You may have no choice but the start at the beginning of the module and work your way through the lessons. There won’t be any points or badge, but you will get a full refresher and may pick up some new things that were missed on the first pass.