Are you working on being able to figure out the notes at different positions on the fretboard (e.g., based on their relation to fretboard landmarks and so on), or being able to immediately identify them (based on their position alone). There are several things you need to know and for the first. I think the 2nd is basically lots of experience. I haven't used that fretboard trainer until just now but it's kind of fun (even though I'm no where close to the high scores posted there) and probably helpful.