Why is Calvin the way he is?

Calvin has lost motivation on learning new information. Calvin does not find useful the information he is being taught by his teacher. Calvin has ask all the time how is this information going to help me. 

Calvin believed he didn't do well in exams. Calvin started to put in his head how he just wouldn't do well in exams. This affected future exams he would do since he would have a negative though of not doing good in exams. He already had in his head for the future exam that he wasn't going to do well.