As a result of this a reputable ATPL theory school which usually had 50% of its classes in Flight Planning pass had only 3 out of the 36 students of the last course pass this exam with the new questions and answers. So the pass rate of 50% of 36 students has gone down to only 8% of 36 students. This means that the new exam has incorrect answers of the questions given or the new exam is far too hard.
Or it could mean the "reputable ATPL school" was teaching to just the old answers and not the syllabus.