6. Complete all training before putting the game down each time.

Since you have to wait for Sensei to repair things each time you use them, it's a good idea to make sure you use all the items and get all the XP and coins you can before closing the game. Training is typically short and makes for easy money.

Before closing the game each time, have each item in for repair with Sensei. This way you aren't wasting any hard earned coins or gems getting repairs that can happen on their own while the game is closed.