Possible Clues:

• Denoting a numerical order in a series
• Maybe first test in which grade lower than C's accepted
• Maybe first exam will be interrupted by unwelcome noise
• Numeral indicating rank order
• A number making a noise during examination
• Ranking number
• Extract of record in a log book
• Like fifth and sixth
• Service book for German Standards spoken about
• Book a type of exam without uproar