You can access a course that isn't connected to a college instructor or high school teacher -- an "instructorless course" -- in order to access the resources of that course. However, if you enroll in an instructorless course you can access all resources EXCEPT quizzes and assessments. Quizzes and assessments include Pre-Tests, Post-Tests, Summative Quizzes, Chapter Quizzes, and Homework assignments.
For more information on how to enroll in an instructorless course, please read Can I enroll in a course that isn't connected to a college instructor or high school teacher?
To access a list of resources for your instructorless course, click "Resources"
Click "Content by Type" or search for your resource using the Search Course option
Resources like LearningCurve are available here to help you study independently.
Click the resource you want to access.
Again, note that you will not be able to access Pre-Tests, Post-Tests, Summative Quizzes, Chapter Quizzes, and Homework assignments