Your homie Hasan Paige yet found another.... xD

Basically Learn how to Identify "Key Signature".....This site is to OP. (overpowered) Look at it and test your SKILLS(Z)....DO IT!!!

http://www.musictheory.net/exercises/keysig

I Hasan found this one (lol)....

This site is really good for learning how to read Treble Clef Music, it helps A lot Check it out.... DO IT!!!

http://www.musictheory.net/exercises/note