The government of Mexico is broadcasting school online and on tv for all levels. A great opportunity to go back to grade school and practice your Spanish. The playlists on youtube are organized by grade, and subjects up to grade 6 (primaria). https://www.youtube.com/channel/UCk-PjGg2A6lN6aGC2jdxQrw
There are also websites for secundaria and bachillerato (secondary levels) but I haven't been able to find an official youtube site for those ones. Not sure why.