Both at kindergarten and at school, parents have the following rights:
Advice and information rights
Parents have the right to receive regular information about basic and current issues in kindergarten and school and the right to information and advice about their child's learning development.
Participation rights
Parents have the right (and duty) to participate in the education of their children. Through the parents' representatives, the parents are involved in the education and teaching work of kindergarten and school.
In parental committees at city, county or state level, parents' representatives can bring in the interests of all parents and have the right to be informed and to be heard on important education issues.
You can find information on parental participation in day care centers in Niedersachsen here: https://www.mk.niedersachsen.de/startseite/fruehkindliche_bildung/eltern/elternvertretung/elternvertretung/elternvertretung-154567.html
Information on participation in the school in Niedersachsen can be found here: https://www.mk.niedersachsen.de/startseite/schule/schuelerinnen_und_schueler_eltern/mitwirkung/eltern_erziehungsberechtigte/5914.html