How to find a specific variation to learn
From your dashboard, click on the course you want to browse
Go to the appropriate chapter
Find the variation or exercise you want to train and click on it.
If you'd like to view a line or exercise in read-only mode instead of training it, make sure 'Book Mode' is turned on.
If you want to review, click on the 'Review All' button on the top right of your course dashboard. At the end of each exercise, you will have the option to move to the next one.