Having trouble studying for tests...?

I am having a lot of trouble concentrating and studying for my tests. I used to have this problem when I was in college before, but now, it seems its just getting worse. I can't concentrate or focus on my work. It's like my mind is off somewhere else. I am on meds for my bp 2 disorder, but I don't think they are helping me with this facet of the problem. I just can't seem to get a rhythm going. Maybe I am not using good studying techniques? I try to use note cards, but that doesn't seem to help much anymore. I highlight the test material and read and study pix, but that doesn't help either. The only thing I haven't done is put on the stereo, light candles, and set the mood...lol. Anyone have any suggestions? Thanks:):)