Cases like this are also where use of reordering scripts can help a lot.
Naturally, you’ll have review items in low Apprentice stages, which are quite important to hit as soon as they become available.
However, due to WaniKani’s default behaviour of randomizing the order of review items, it will often happen that those reviews don’t show up in time. And when they do show up (days) later, you’ll likely fail them again.
By using something like [Userscript] Reorder Buttons, you can make sure to do those reviews in time.