Law of Attraction

I am currently reading The Secret, so I learnt about Law of Attraction.
Well, exam was just over, and I realized a trend in IMU, not everyone but in general

Every time right before exams, most students (category A) will keep saying
'die la die la'
'oh no I am gonna fail'
'I am so screwed for this exam'
'shit!'

Well some of us, including myself, the minority (category B) will say

'I can do it'
'Get A, sure can one'
'Don't panic, I can do it'

Interesting enough, category A are the students that do well.
and those in category B don't do so well.
Unfortunately I am in the category B.
I guess the Law of Attraction don't quite work in this case.

And Seriously! I am sick of those people in category A.
I mean it.
I just wish everything that come out of their mouth would come true.
I asked a few of them to stop saying negative things before exams, and they respond by saying
'I can't help it!'
I mean, really? If you can't help yourself, who can?