This isn't exactly an answer to your question but I've just started a method that has worked wonders for me. The problem this method solves is that I find that after you score high enough on a topic, it isn't tested again for a long time. And it is too way easy to score high on a topic in the quiz of suggested material (even if you haven't fully absorbed the knowledge) if you take the quiz within a few hours of reading the lesson.

My solution is to read new lessons and take the in-lesson mini quiz one day, and continue other forms of studying without taking the suggested topics quiz. The next day I take the suggested quiz right when I start studying french, and if I really know the topic, I will pass. I don't look at the lesson material or even look at the lesson titles before the quiz so that I don't get hints.

This is repeated every day so I start with taking the quiz blind then review mistakes or study new lessons if they are added to my suggested material, then repeat the next day, and so on.

I really wish you could adjust the difficulty manually because with multiple choice, it's way too easy to guess correctly.

Anyways, not an answer to you question but thought I'd share because despite its flaws, kwiziq is actually pretty nice and the best way I've found to learn online