lectures

Hello!!
this weather is killing me, well at least with this could weather it´s not like to go out, then you stay at home studying, hehehe.
I´ve been listening a lecture online http://es.youtube.com/watch?v=Oe61eFxhxVM&feature=related about blended learning, was difficult because it´s the first one I see without subtitle but it´s nice because is more similar to a real one.
It was interesting because the topic they treated is in relation with university and I can compare it with the studies I´m doing now, that have also some self-study on-line for example the lecture I´m listening. I took some notes and I would like to go to a real one to be ready for my degree next year.
Other side, because I know I´m not so good with preposition I did from the academic word list some exercises like thishttp://www.aal2.unibe.ch/englisch/eap/SleepPrepositions.htm where I found some difficulties on (pay attention to, exceed of, traced back to, divide into, typical of, during the night, but for example I didn´t know during is a preposition) that´s why I´d like to ask for a preposition list to help us with this problem I think too many people have, anyway my score was 57% I know I have to improve it but for me it´s not so bad this score.