students r trying their best to get an A by trying to please their teachers....

Yeah, I don't think that's a good idea--it pretty much amounts to bribery. Instead of grading each student based on merit, each student would be graded based on the amount of money they have (as only the rich can afford to lavish the teacher with presents). Also, it's extremely unfair for the poorer students and only helps to exacerbate the class divide. However, the teacher could've also been interpreting the students' gift-giving wrongly. I sometimes give gifts to my teachers, but I usually give it to them if I feel like they've done a really good job teaching. It has little to do with grades (I try to give them after the grading period is over, but sometimes that's impossible as we don't have classes after that's over), but it's possible for teachers to think we're bribing when we're not.

I think it's a bad thing to do that because it looks like it's bribery. If I were the teacher I wouldn't allow them to do such things because it would look bad to both ends. If students really want to get high marks then they should do their best in academics at the same time have a good attitude