Student A passes because his listening score falls within the Borderline Fail range of scores, but it is close to the higher end of this range—64%. The higher scores in GVR and speaking compensate for the failed section.
Student B
Student B has the same section results as Student A, but he fails the exam. His score in listening is very low in the Borderline Fail range, closer to the lower end of 50% for the Borderline Fail, and his performance in the GVR and speaking sections is closer to the lower end. He has a bigger "gap" to compensate for, and his two better scores are not enough to cover the gap, so he fails the test.