In 2007, my equity, financial statement and so on big-score parts were rated over 70% but still managed to fail the exam. One reason might be the distribution. I guess many candidates had very close scores, or even same scores as the passing threshold. According to the normal distribution theory, candidates on the farther side of the tail will be eliminated. The distribution might be constructed based on the last name. If your last name happens to start with W, X, Y, Z, the chance to be eliminated might be larger than those started with A, B, C.