August 2015: http://www.i.u-tokyo.ac.jp/edu/course/cs/pdf/2016computer-s....
February 2016: http://www.i.u-tokyo.ac.jp/edu/course/cs/pdf/2016computer-w....
Edit: Looking at the exam guide [0], it seems that it's only if you want to sit the exam in the Summer that you must also take the separate maths exam; the Winter CS paper already includes maths questions so there is no separate maths exam.
[0] http://www.i.u-tokyo.ac.jp/edu/course/cs/pdf/H29csguide_e.pd...