Legitimate question: If you know that you want to go to graduate school in chemistry, then why major in biology? Why wouldn’t you major in chemistry or at least biochemistry? You’ll be more competitive as a chemistry major, or at least if you take the same classes that a chemistry major would take. (If the answer is because you prefer biology…then why not get a graduate degree in biology rather than chemistry?)
Regardless, if you have to take the Chemistry GRE you need to take the classes that are going to prepare you for it without relying solely on self-study. So take PChem AND inorganic.