I started studying Thanksgiving week. On average I studied about an hour a day (some days more, some days less or not at all). For the couple of weeks leading up to the April exam, the average went up to about 2 hours a day. I ended up passing.
I truly believed that I failed the Chemical PE. I answered about half of the morning questions with certainty and about 75% of the afternoon questions. Miraculously, I got a letter in the mail today saying that I passed.