Mixed set
Marks and lights
A cardinal mark, a lighthouse rhythm, a ship's sidelights and a chart symbol — four answers to "what is that light?".
Drawn across the whole group, leaning towards the topics you get wrong most, as far as the questions written for those topics allow. Expect it to feel harder than a single-topic drill — that difficulty is what makes it stick. Every visit draws a different set.
Dealing your set
Rather take them one topic at a time? All topic drills.