While we don't recommend it, you can skip lessons in the eLearning course. The online grade book will not be accurate. But, an easy fix is to use the simple grade grading method listed under Grades in the Teacher Guide (link)
Keep in mind, Math U See is missing many of the concepts, like Geometry, Computer Math, Technology applications, etc. that are taught in Shormann Algebra 1. Please be very careful about skipping lessons or problems.