We spend a lot of time before starting recorder getting used to the reading the music staff. These worksheets are great to give students extra practice labeling pitches on the music staff. I assign these worksheets for about the first five minutes of class at various days during the recorder unit. For the first few times, I don't make them finish in a minute, but give them 2 to 3. As they get better, I shorten the time to one minute. The students also get to race against me in filling them out (I give them a 10-15 second head start - they love it). I used to just use B-A-G and B-A-G-E, but now I've created a full set that follows the notes the students learn.
A Mad Minute Example - B-A-G-E
I also have a set of three music spelling worksheets. The first two (Lines Spelling and Spaces Spelling) are just for practice. The third (Lines and Spaces Spelling) I give as a quiz.