College football rankings, grades: Alabama earns 'A-', Oklahoma gets an 'F' in Week 5 report card | CBS Sports Headlines College football rankings, grades: Alabama earns 'A-', Oklahoma gets an 'F' in Week 5 report card Early returns from conference play have shown that College Football Playoff contenders need to … Continue reading College football rankings, grades: Alabama earns 'A-', Oklahoma gets an 'F' in Week 5 report card