At home practice is a vital part of musical success. A practice tool like a metronome can help develop consistent rhythm. If you don't have one at home, try this link for a free online metronome.
For those of you that have an iPhone, iTouch, or iPad various musical applications are available to help your child tune their instrument or practice note reading. For a tuner app. I recommend Cleartune. For note reading there is Sheet Music Trainer available in both Treble and Bass clef. I also use an app. called Music Journal to organize my own practice time. Check out http://www.apple.com
for these helpful tools to make practicing more fun and time efficient. Kids who practice look like this!
Being prepared raises self esteem and really adds to the enjoyment of playing in a musical group. It's a truly rewarding and amazing experience. Try it!