There are several scholarships for pupils in the state of Berlin. An overview can be found here: https://www.bildung-und-begabung.de/begabungslotse/laender-special/laender-special-berlin/stipendien-berlin
Pupils and trainees from low-income families can, under certain conditions, receive benefits according to the Federal Training Assistance Act (BAföG): https://service.berlin.de/dienstleistung/324985/