Center Listening Test

UPDATE (Jan 24, 2009) : I have created a new blog exclusively devoted to Center Shiken English and English Listening, for more information on the Center Shiken English please go here from now on ---> Center Shiken

At my high school we have two different courses, one sends students to private universities (Shiritsu) and the other one to public universities (Kokuritsu) in Japan. in general the public university entrance examinations are more difficult than the private ones.
so, last week i gave the second graders their first Center shiken Listening practice test. i didn't give them much advise but just suggested them to concentrate for the duration of the test which is thirty minutes. this is the top class of the two. the other class which has many students who are a member of sport clubs (Bukatsu) had their try to day and didn't do very well. Bukatsu really prevents the students from studying as hard as they actually should. at the moment they practice for twenty minutes a week with easier listening text books but i am considering to increase this to about thirty minutes a week by the end of this second term.
the maximum score of the Center listening test is fifty points, that is, two point a question. the current class of third graders which will take the Center listening test does the test at about thirty two points on average, which is a bit higher then the Japanese average but not yet satisfactory to me. we'll do more practicing about one and a half month before the actual Center listening test is on January 17 and 18. minus the winter break that means I'll start increasing practice around mid November.