I think this may be the wrong category I’m not really sure but anyway I have a suggestion:
When we choose the ‘Learn new words’ option it starts teaching us new words and then questions us on the newly learned word. Usually we can eliminate the wrong options because we haven’t learnt them however I think it would be helpful if the questions’ answers contains some of the other words you are learning.
Here’s an example.
Say you are doing Korean and learning the words 개 (dog) and 고양이 (cat), after you learned the word 개, it’ll ask you what does 개 mean and give you multiple choices. Of those choices, at least one should include other words you are learning for example 고양이.
Ask if you need any more clarification.