The language courses are based on the level of knowledge of the students. For children who are not yet literate, there are special offers to enable them to attend a regular school. For children who are already literate, there are special preparatory classes at mainstream schools. The children change to the regular classes after successful language acquisition. There are schools where children take part in a regular class and attend additional language courses. Please ask about the offers in your specific case.
For additional information see https://fluechtlinge.hessen.de/flucht-asyl/hessen-handelt/sprachfoerderung-schule