How to get my nephew to leave me alone?

My 6-year-old nephew made high school living hell for me. My mother always forces me to play Minecraft and other stupid games with him whenever he comes over to our house even if I'm behind on my schoolwork or trying to study/take a test. One time he even tried to make mom establish a rule where I couldn't do schoolwork and other important duties whenever he's around! Basically when I get into his field of vision, he becomes addicted to me and never wants to leave me alone. If I don't play with him, he'll tell mom and she'll force me by using excuses. I had to go to summer school every year because of this. I tried to tell my little sister to play with him, but she refuses. My mom complains about how I don't spend enough time with him. Infact, there have been days were I played Minecraft with him from the time he got up to the time he went to bed. I tried setting a timer, but he kept on making me extend it. If you give him the inch, he takes the mile. It's like I'm his drug! Call me an a##hole all you want, but he makes my life difficult and sience I'm a 19-year-old man who's going to college pretty soon, he can't be doing this to me. I hate him!

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