The result for QT you took last month(March) was announced through my snu website.(only for MS, PhD)
You may check the result as follows:
http://my.snu.ac.kr/mysnu -> 졸업 -> 시험성적 -> 종합시험 판정결과
If you see '합격' on 종합시험 판정 결과, it measns pass / In case of failure, you can not see any sign.