FL has strange K requirements.

You don't have to go to school until you are six. You have to at least be six to go into first grade AND have completed K.

So on one hand you don't have to go to K but on the other you can't go to 1st unless you went to K (public or private).

Except if you document that you homeschooled K, you can sometimes get provisional placement into 1st and within a certain time period the child has to prove him/herself or be put into K.