Anyone start pre-school in middle of year

[Anonymous]

We are going to be foster/adopting a relative's 4 year old (almost 5) coming to live with us later this year. We are planning to enroll the child in K next fall. Anyone enrolled in pre-k for just for a few months? My kids went to Montessori so I don't know about other options but would like to be prepared in case pre-school won't be possible. The child has not had any formal schooling and would need to start learning to identify alphabets and numbers etc.