The biggest collection of useful apps for students. You'll find help for almost every instance of school and mostly for free! Check out the site for more details for each app and alternatives for your specific mobile device.
Free iPad apps for the classroom - These are just a few apps (Math/Reading) that creatively teach problem solving, critical thinking and fundamental skills in these disciplines to help kids have fun with learning.
Por si algún profe quiere investigar sobre estas 70 apps y ver si le son de utlidad. Yo uso algunas // The 70 Best Apps For Teachers And Students - Edudemic. These are listed as itunes apps, but I'm sure a lot of them can be found for Android as well.