Behind with mathematics

I am behind in all of my subjects at the moment and really feeling the strain. My work is increasing in difficulty and, while I can cope with this intellectually, I have not been able to commit the required time to study. Falling behind is awful as it increases stress, usually stopping progress with the current work. I am disappointed in myself at the moment — especially after failing (probably not an A) my January exams I took recently. Other people in my class seem to be coping fine; I wish that I had their commitment and confidence. I used to be the best in all my subjects yet I am struggling to keep up at the moment. Finishing my mechanics class/home assignments before anyone else gave me some confidence back and hopefully things will improve — they seriously have to as another mistake this year could ruin the rest of my life.