I would talk to the principal at the school to find out if they are willing to test prior to 3rd if the need presents itself. Our district has the same policy, but DS was tested almost immediately. I agree that there are valid reasons for spending at least a portion of the day in K. If for no other reason that to spend time with age mates and learn how to "do school". My son is differentiated through several different grade levels throughout his day but he still does lunch and recess with the K class.
It should be clear fairly quickly if your child needs more than K can offer. It also is determined in large part by the teacher he's given. Speaking to the principal early may give him a teacher chosen with his needs in mind rather than just a random pick.


Shari
Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!