Joan of Arcadia - Season 1 Episode 2 -

Joan heeds God's advice to stop squandering her potential by enrolling in an advanced-placement chemistry class. There, she's partnered with two of the school's biggest underachievers. Elsewhere, Will is frustrated when a murder trail goes cold due to an arson investigator's overly-thorough examination of the crime scene; and Helen is eager for Kevin to get a car after he passes his driver's ed test.