Download JA Sensei 3.6.2 on Google Play. Here are the modifications:

• Kanji: references for 2 new books added
• Lessons: lesson 15 not readable FIXED
• Lessons: lesson 2 exercise 2 not available FIXED
• Vocabulary: drawing quiz had a few issues FIXED
• General: improved connectivity to the Internet for faster and more reliable communication
• General: several other bugs FIXED

Besides, don't forget to register for JLPT (internation test to assess your skills in Japanese). Registration are starting now for the exam session in December. Please read this announcement for further information.