Take a scale, say C major, and play the triads for each scale degree. Example, 1st degree is C,E,G, 2nd D,F,A, etc. Do this in all majors, then all minors, then diminished and augmented. This will see whether or not you REALLY know your scales. If you can play all the above, smoothly, without stopping, you wont be needing our advice anymore....
