Why Students should be serious in their Studies?

Serious in Studying is the most important part of learning.To be serious of studying is the key to success.Being a student must have a good moral character.Because we study not to have a new friends but we study to have a good future in the present.
Suggestions:
Being a student he/she wants to have a good/higher grades.But it depends on giving important of student in his/her studying.
Some Tips:
*Study every lessons very well
*Listen to the instructor while teaching/discussing
*Students must be open-minded