If a person reprograms their brain to achieve beauty and high exam scores through the law of attraction and low-frequency messages, could this be considered Shirk?
Insofar as Allah has granted us an imaginative faculty and the creative faculty, it is not shirk to imagine a future that we would like, or to change our thinking (as long as it is not causing harm or something haraam).
Of course, you will still need to study for your exams!