Sounds like you still have five testing months, Oct-Nov, Jan-Feb, and April (depending on the date your BEC expires.)
You still have plenty of time! I wouldnt recommend signing up for three in one window since you still have 5 testing months to take three parts, including the two blackout months of Dec and March, so you still have 7 months to take three sections.
Use your time wisely, and try to schedule ur exams well ahead of time so you can get the april date you need. So long as you take the last section before the BEC expiration date you will be fine. Even if you dont get your last score until after april, its the date you SIT for the exam that matters.
I would try for two per window, and then you have a time to retake any failed sections.
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