Welcome to Health Care Magic
This is your forth year, and you should now take it seriously. The things like bunking lot of classes, spending time on internet, poor sociality are considered normal to some extent. But if they increase in severity like in your case then it should not be ignored. Poor concentration, carelessness, lethargy
are due to your ignorance. Try to participate in out door activities, play with batch mates. Start doing assignments regularly, its never late.
Other thing I would like to tell, if the symptoms persist then visit a Psychiatrist
as it may be Mild Depression
. Mild Depressive Episode may present with such symptoms of poor concentration, lack of interest in any thing, social withdrawal, lack of energy etc.
Try to control by your self or visit a Psychiatrist.
Dr. Seikhoo Bishnoi