Two weeks ago when a judge struck down California's exit exam, 17-year-old Salvador Rodriguez thought he would be graduating from high school in June with his friends. But the state Supreme Court's decision Wednesday to reinstate the exit exam has thrown Salvador's diploma in limbo, again. The Richmond High School senior has taken the exam twice, but doesn't know if he passed his most recent try. "I'm anxious, nervous. There's a lot on my shoulders," said Salvador, who dreams of attending UC Berkeley. "In a way, it'd be cool to let us graduate, but that wouldn't be the honest answer....