This Android alarm clock has dramatically increased my speed and ability to do simple arithmetic: https://play.google.com/store/apps/details?id=com.alarmclock.x

This Android alarm clock has dramatically increased my speed and ability to do simple arithmetic: https://play.google.com/store/apps/details?id=com.alarmclock.xtreme.free https://play.google.com/store/apps/details?id=com.alarmclock... It allows the user to set an alarm that can only be turned off by solving math problems. You can imagine how quickly one's brain improves at this task when the reward is a snooze or a removal of a blaring alarm at 5 in the morning.