  In addition to the learning check testing results performed at each lectures,
we have extended the factors to find the key dropping out factors. Among them
are, the number of successes in the learning check testing, the number of
attendances to the follow-up program classes, and etc. Then, we have found key
factors strongly related to the students at risk. They are the following. 1)
Badly failed students (score range is 0-39 in the final examination) tend to be
absent for the regular classes and fail in the learning check testing even if
they attended, and they are very reluctant to attend the follow-up program
classes. 2) Successful students (score range is 60-100 in the final
examination) attend classes and get good scores in every learning check
testing. 3) Failed students but not so badly (score range is 40-59 in the final
examination) reveal both sides of features appeared in score range of 0-39 and
score range of 60-100. Therefore, it is crucial to attend the lectures in order
not to drop out. Students who failed in learning check testing more than half
out of all testing times almost absolutely failed in the final examination,
which could cause the drop out. Also, students who were successful to learning
check testing more than two third out of all testing times took better score in
the final examination.
