I'm on the Possession section in French and it won't let me peek at all. There's sound and I can type but I can't peek on words I don't know. I can't peek on any lesson (I've gone back and tried) and I don't know what to do.
It lets you peek when you're learning German, as far as I know. But I"m here only to learn German, not any other language. I agree, you should make some flash cards, and study them. I've got a small composition book where I write down words I'm having difficulty with, or notes for the language. Try that as well. It really helps.