I am a 16 year teen who still uses Khan Academy. It is positive and a very helpful place to be. In my school years I was really bad at math, ELA,and science. As I started to use Khan Academy it helped me so much I never thought after doing Khan that things were so much simpiliar. To be honest I would recommend any kid at ages 4-18 to use this site. It gives you tips, helping others, videos, and assignments to do. I honestly have to say I'm going into the 11th grade with a GED and now at this age working on college classes to become a nurse. I thank Khan for helping me out so much! :)