During drills, you can isolate a specific skill or skills. During practice matches, you can test those skill to see if you are implementing them correctly. A practice match is like a quiz. If you want to do well on the final exam, you need to take the quizzes to test yourself. If you are failing every quiz, then you need to learn the content better. If you aren’t performing well in practice matches, then you need to go back to the practice hall and work on specifics.