Mass failure as the Nigerian Law School releases results

Choi! The Nigerian Law School results was released in the early hours of today August 6th and according to a LIB source, a lot of students failed. In fact, they estimate that about 60% of the students failed the exam, about another 25% with General Pass and only 15% making First Class, Second Class Upper and Second Class Lower.
This is the second time the Law School will be turning out a large number students with woeful results. Many of the students are devastated. But what is going on, why is this happening?