What is the ruling on a teacher helping a student in an exam? And does the crowing of roosters mean they have seen angels?

It is forbidden for a female teacher to practice cheating or to favor one student over others, even if it is due to her admiration for the student's beauty, activity, intelligence, or personality. She may praise the student for these qualities, but enabling her to cheat is forbidden. As for the second part of the question, what is mentioned in the hadith is correct: "If you hear the crowing of a rooster, ask Allah for His bounty, for it has seen an angel. And if you hear the braying of a donkey, seek refuge in Allah from Satan, for it has seen a devil."