Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. I do not think that there is anything wrong with your concentration. You must introspect yourself to know this more. You are able to watch a comedy movie for two hours. You can play a video game or any other indoor games continuously. This means you have good concentration level. What is troubling you is your lack of interest in studies. That is normal. But you cannot go on like this. Change the way you see the learning process and enjoy learning your subjects. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.