Aural | As well as the books and CDs that we use in lessons, you might like to try these online tests (there are some free samples but most need a paid subscription. ABRSM and Trinity aural tests are both supported) Or you could use the ABRSM aural trainer on your iPhone or iPad for extra aural practice.
SIghtreading | If you use iTunes and you need more sightreading practice, try this app. The app is free but you have to buy the music for the grade(s) that you want. Special feature - it deletes the music as you play so you have to keep going!