I also failed the Str I in April. I took the Civil exam with Structural depth in October and passed! The morning was cake. I tried to be careful and take my time, and I triple checked everything, but I still left the exam room at 10am. The afternoon section was comparable in difficulty to the Str I, IMHO, but I was much better prepared this time: Practice problems, practice problems, practice problems. I left the exam room with about 45mins remaining in the afternoon section, whereas I went right down to the last minute or two when I attempted the Structural I exam.