Source A is not a reliable source about the behavior of Class 3E1. While the form teacher, Mr. Shashi, claims the class is well-behaved, Sources B and C provide evidence contradicting this claim. Source B describes the classroom as messy and littered when he teaches. Source C acknowledges the students are bright but says they misbehave by being noisy and changing seats, like other students. As the form teacher, Mr. Shashi has a stake in presenting his class positively, but the descriptions from other teachers who interact with the class contradict his claims.