Inspiration, motivation?!

Inspiration, motivation?

I'm 12. I'm very good at losing things and irresponsible and v.bad at managing my time. I can do study, revise etc. If i go for something motivatinal or inspirational talks or read such books. Problem is that motivation only lasts for about 2 days or so. After that i try making to-do lists and i get distracted when doing homework. I'll tell myself i'm gonna have a ten min break in the end, it turns out to be a half-a-day break or so. I really don't know what's wrong with me. How can i make myself study with interest undistracted and totally motivated? I try to remind myself of my goals but at that point of time, they don't seem important to me. I have a very non-distractive studying environmnet. Just whne i have to do assignments on the comouter, I get distracted by going to utube, messenger, music etc. Any useful advice please?

Before you start studying blindly for a few days and then running out of steam, sit down and make a schedule. Break down what you have to study into days and save one or two days at the end for reviewing. Study each day whats on the schedule and thats it- and dont be too hard on yourself- you can only fully concentrate for about an hour at a time before you need a short break. During break time-do not get on the computer, get up, walk a little and stretch, then get back to your studies for another hour. Dont overdo it. After studying, give yourself a reward like playing a video game, watching a movie, visiting friends, etc. Hope it helps.