strengthen skills is no good?
I'm level 15 on german, up to the 'business' skill. But whenever I click strengthen skills, I get really really easy questions. Some of my lower tier sections do need practice, but sometimes I click strengthen skills and I get words like 'woman', 'girl', 'bread', 'water', 'girl', 'bread and water' etc for the whole exercise. it's a waste of my time. Even when I make a lot of the lower tier skills golden, I still get ridiculously easy questions.
I want to be able to click strengthen skills and update 2 or 3 or 4 of the lower skill groups at once, brush up on those and move on. it's really boring having such easy questions on the strengthen skills option, and it's really boring having to do each lower tier skill indiviudally, and its frustrating not being able to use the strengthen skills button to actually strengthen words from a range of groups.
Once you've got all your current skills to gold it will start to behave more like you want, giving words from a variety of lessons. It also gives you more complex translations as your fluency increases I think.