In this case the class teacher of your child is the first contact person. Parents, together with the school should consider which help can be offered, which measures are meaningful.
Advice on special measures is also available in the four Regional Counseling and Support Centers (ReBuZ) https://www.rebuz.bremen.de/startseite-1459
Pupils from families who get help for living can get benefits for learning support from the education and participation package (https://www.service.bremen.de/sixcms/detail.php?gsid=bremen128.c.46178.de).