Probably because your friend has more of an aptitude for math.
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I think it is harder than math. You usually need to get straight A's on math to get into pre algebra
It is clear from the question that you do not appear to be bothered about your spelling or grammar. If that attitude is also apparent in your mathematical work then maybe your teachers felt that you lacked the necessary commitment.
Pre-Algebra
Advanced math
I just took Pre-Algebra and I did Geometry Probability in the beginning you had to understand integers and square roots and perfect squares but it was more stuff than that , i guess it was a lot of info in such fast time . But that is just a sneak peek of what it is .And if you understood everything in regular math then you should get pre algebra easy