[Skunkworks] CISM recommended Study duration

Hello good people, I signed up for CISM and should be writing my exams this coming December. I have never had enough time to prepare well for the exam (i.e. I only started reading and am still at the very initial topics) and I now have two options: 1. Dedicate time to study in the remaining one month or so (which I feel is too soon) 2. Defer the exam to June next year (which I feel is too far in the future). My question to guys who've done this test in the past (and passed) is whether a month would be sufficient to study for CISM or not. Thanks! S.