There must be a balance of mind and brain to do any work. Unless the mind is calm and pure then our thoughts cannot be right. Our thoughts reflect our deeds and character. The pure mind can think better only when it is free from jealousy and greed.
If the mind is pure then the thoughts will also be born pure in it. These things are also the essence of students life. If we study with clear intention then understanding of the subject will also be created in us. If the mind pure then the thoughts inside it will also be pure, if it is clean then the result of deeds will also be produced towards oneself and others. Students are usually though that 'success comes from working hard',but, it must be said that, there is a happy ending to the exam. Do holy deeds with your pure heart.