You can always book at 11 months out, but the points will be taken from the appropriate use year. If you have no need for the points in your '07 use year, you can bank them into your '08 use year to be used for reservations falling within that use year. If you need additional points for your reservation that require more than you will have with both the banked '07 points and the '08 points, you can borrow some from '09 at the time that you make the reservation.
Which use year is your contract? That means which MONTH is your use year in?