Related Clues:

• A nuisance, accepting time needed to get very fit
• A phosphorus match is most convenient
• 'It's probable . . .'
• Its highest score is 5, in brief
• Source of college credit, informally
• 'In all likelihood . . .'
• 'It's probable that . . .'
• “In all probability...”
• “It’s a safe bet...”
• Exam for some smart H.S. students
• Culmination of a college-level H.S. class
• Exam for some H.S. seniors
• Source of college credit, in brief
• "If I had to bet ... "
• Calculus AB or Physics C, e.g