One thing that has really helped me is BishBashBosh. This site will test you on your apprentice 1 items, recently failed, 10 oldest apprentices and/or 4 ancient gurus. It tests by having you repeatedly answering what WK is expecting, but a couple times in a row if you get it correct, and many more times if you fail.
For me, I find this useful because it helps cement in the wording of the vocab, or get used to seeing the Kanji. With WK, if you miss something, you see it again in two hours. With BBB it is immediate, and helps me identify the items I will probably have trouble with.