<human>: Can you give me the gist of the text in a nutshell?

My GPA dropped by half a point already, and it's getting harder and harder to stay focused.  I know I'm kidding myself when I say, "it's okay, everyone has senioritis," but I find myself pushing off work as long as possible.  I used to get things done right away. I'm the guy who goes home and does his homework (after a quick snack) right away, and then waists time on reddit for the rest of the night.  But lately, I play games on my laptop in school, say "fuck that (yao ming face)" to almost ALL of my work, and I haven't exercised in weeks.  I've only just realized that I started doing this after I failed my recent chemistry test.  I had an A fall term and I'm barely getting a B now.  I'm in the same situation with math and biology.  But english and spanish are the same (I guess those are the easier classes).  

I'm not asking for life-hacks (I still apply many of those daily), just a couple guidelines to get my act together, and buckle down and start being a good student again.
<bot>: How do you stay focused during study time? And how do you prevent yourself from procrastinating? (sorry if that's confusing)