These drum beats and drum fills exercises are for drummers that have learned how to play basic beats and fills already. A strong foundation in Snare Drum Sheet Music would be extremely useful here due to the style of the drum fills being based on snare drum rhythms.
After the first bar of drum beat, there are two ‘repeat the previous bar’ markings. Here the drummer may either copy the first bar, or develop the beat slightly. Each exercise should be repeated at least once before stopping and trying the next one.