If you have just started to learn Japanese, don't forget to study Japanese writing, too! To learn hiragana well, the key is to practice, practice, practice. Even if you have only a few minutes, practice reading Japanese every day.
To check your Japanese skills in Kanji, Vocabulary and Japanese Characters, try these free Nihongo quizzes. Plus, if you are planning to take the Japanese Language Proficiency Test (JLPT), be sure to check out the 3 JLPT quizzes.