Dear Wysiwug,
These are questions that only you can answer. You need to determine what matters most. Taking the exam in October? Taking the exam at a test center? From your note, you effectively have only those two choices. Either choice will require an adjustment on your part. None of us on the boards can help you with that decision.
You mentioned a "fear of forgetting something." That is symptomatic of a bigger issue. The PMI Exam will test your understanding (as opposed to mere "knowledge") of the processes in the PMBOK and how they integrate with each other. If you are to master the exam, you must master a thorough understanding of the integration aspects of the processes and knowledge areas, which may require more study and practice.
Good luck!
Harry