Hello! I just have a question for the tests in the courses. I don't understand why I am getting an 80/100 on my tests even though I got all the answers correct. Is it some type of error or did I ge...

1. Közösség
2. News and Updates from Khan Academy
3. Content Update: New High school physics course, expanded science AP/College courses, and more!

I'm looking for advice. I want to study physics but don't know which should I pick high school physics or physics library. I'm a 9th grade student and starting khan academy. Which do you recommend?

1. Közösség
2. News and Updates from Khan Academy
3. Content Update: New High school physics course, expanded science AP/College courses, and more!