While it is recommended to at least read the course work in order so it is more easily understood, many of the assignments are able to be temporarily skipped. If you find yourself stuck on an assignment, then feel free to set it to the side and work on another assignment instead. Also contact your trainer through the method of communication they provided in their welcome email, or through a comment on one of your submitted assignments. They will be happy to listen, brainstorm with you, and find solutions.