Flashcard Tip

Do you ever want to drill a student on notes or chords, but have to sort through the cards to find all the notes they know and take out the ones they haven't learned yet?  I finally came up with a easy system to help.  I have organized my flash cards according to the students level.  I use a sticker that is the same color as the students books and place it on the back of the card.  I use Faber and Faber a lot, so purple cards are all the notes they will learn by the end of the book.  Then red cards add High C position and some notes in G position.  This saves me a lot of time!!!