Why we can't access the files exposed on the course J

I'm doing Java SE: Complete Programming (1Z0-819-J) on the 25th anniversary of Java. Otherwise, I am not finding the image (or user) to see the exercises explained in the videos.

I understand that it is not really complete material, but I miss the logic of the exercises with incomplete material to study.

PS .: I don't want access to the laboratory, but to the files with the exercises to perform the training correctly.

Ps.: This is my 3rd certification on the Oracle platform, and I have more than 10 certifications in my life. That experience has not been a good one now.