Always sleepy and not hardworking. Well?

You must be in comfort zone as all your requirements are being taking care by someone else; maybe parents, relatives, guardian etc. Life is unpredictable, it is time for you to work on your priorities and set goals in your own interest. Answering your question, "How to increase my will to studying well?" , you do a self-assessment about your own future considering life with good educational qualification and life with your current qualification. Once you set your priorities and have realistic goals, you will be self-motivated to put all efforts and study well. If still sleepy, consult your doctor for a complete health check-up to rule out any deficiencies. Consult a Counsellor in your city, for further help.