This app has great customer reviews and it is for learning the vocabulary and kanji required for all five levels of the JLPT (Japanese Language Proficiency Test).

• includes over 2000 kanji cards
• includes over 7000 vocabulary cards
• users may choose which individual cards are included in drills from each deck

These decks do NOT contain romaji because using romaji is a really bad idea if you're serious about learning Japanese. Learn Hiragana, you'll be glad you did. (There’s an app for that)

During a drill...
• get a card right and it's taken out, get it wrong and it's shuffled back in
• add more cards to the drill as you gradually learn the whole deck
• swipe gestures for quick drilling
• go back if you need to recheck a card

All the decks are free and included in the app.

Regular practice and review is the only way to prepare for the JLPT.