Trouble buckling down on school work?

Question

I'm a junior in high school and my entire life I've been really great in school. I mean, I cried when I got my first C at high school, just to give you some background. I am in advanced placement classes; this could be the problem but it never has been this much of an obstacle before. Freshman and Sophomore year I've done great, but for some reason I'm having major issues trying to buckle down on my work. It's like I can't grasp when things are due and I don't realize they will be as difficult as they are. It's been like this for a month or two now and my grades are starting to fall. A teacher (not my teacher) commented that I was too young for 'senioritis,' is it possible that I am not?
symptoms: tired, heavy procrastination, "numbed" emotions, lack of enthusiasm/motivation, unable to think clearly
Note that I have been tested for A.D.D. (multiple times) and I don't have it.
Please don't leave joke answers or just comment on things I've said instead of answering.

Answer 1

I was always a good student in high school and all throughout my educational life, and I had the ability to do well on tests while barely studying for them. It was good for me up through high school, and I got into a very good college (University of Pennsylvania). And now that I'm here, I'm having the exact same trouble as you are. The problem is, in my case at least (and quite possibly yours) is that you've never developed proper study skills

So I'm going to suggest for you what I've done. I make myself a schedule, and tell myself what I'm going to do and when I'm going to do it, and, short of a dire emergency, I do not deviate from that schedule. So far, it's really helped me.

Good luck!