Not a bridge post really

For someone who doesn't like bridge books, I'm sure reading a lot more of them. This is due in large part to commuting by bus. The truth is, I still do not read at home very much. But I read during my lunch hour and on the bus. I'm enjoying it. I'd like to think I'm learning something.

The problem is I'm not learning/retaining as much as I'd like. There's an awful lot of to take in. I'm under the impression that there are techniques you can employ to boost the efficacy of your study time. Anyone know of anything I can read on the subject?