Course locks and timers
One of the latest features in Lingopolo is course timers and locks. The problem previously is that you would be faced with lots of courses, some of which you might have studied a bit, and some not, and you never quite knew where you should be studying next.
The introduction of course timers and locks will show you exactly where you should study.
The initial state for each set of courses is for the first course to be unlocked and the others to be locked: