They way I studied...if the subject was boring, I made a game of finding all the hidden connections, all the "meta-causalities." F'rinstance, I took Anglo Saxon for a semester, which I didn't think was boring but I did think was difficult, particularly when it came to grammar. It was little "a-hah" moments like this that kept me going:
The word for 'city,' in Old English, is 'ciester.' Pronounced chester. Like Dorchester, Manchester, and on and on.
By finding these little moments of connection--in plays, for instance, I'd find (or create) overarching motivations that attached certain words to certain characters because of their specific behaviors and desires--I built a 'web' of knowledge instead of a hierarchical outline. I grew up in the days before the Internet, but looking back, I studied and internalized knowledge and information in much the same way a web page presents information, with links to pertinent supbjects or items embedded within the topic itself.
As for not being distracted? My mom was very good at that, and it showed when I went to college. So I invented deals with myself. Can't go have dinner until I finish all of the next three chapters/reading assignment/rough draft of weekly paper. I'd make sure the phone ringer was off. I'd politely ask people to not try to get in touch with me until a particular hour.
And to make sure the things I studied took, I made sure I got good sleep the night I studied. I cannot stress enough how much of a difference this makes.
I hope some of this was useful--it allowed me to get myself a master's degree from an ivy league university. And people say ENFPs can't finish anything!