This is good review
This app is good review. However, I find it too easy to guess when I dont know what a word is. It would be nice if when asking for a verb the only options were verbs. Its too easy to pick the one that ends in る. The same with numbers and other easily deduced words.
CrankyAshley about
JLPT Study, 1-5 Level Kanji and Vocabulary Japanese Language Proficiency