"If I'm playing with Ozzy it's just a guitar thing. But with the vocals I feel like I'm studying for the SATs"

This quote by Zakk Wylde talks to the distinction between playing guitar and singing. Wylde is saying that when he plays guitar with Ozzy, it is a more unwinded and satisfying experience. However, when he is singing, it is more like studying for a test. Wylde is suggesting that singing needs more focus and effort than playing guitar. He is suggesting that singing is a more difficult job than playing guitar. This quote likewise speaks with Wylde's dedication to his craft. He wants to put in the effort and effort to perfect his singing, simply as he would for a test. Wylde's quote is a testimony to his dedication to his music and his desire to be the best he can be. It is a tip that hard work and dedication can pay off in the end.