You didn't read the description carefully:

"returns true if the sum of the squares of each element in a is strictly greater than the sum of the cubes of each element in b"

You're comparing squares to squares...

I actually am currently going to a bootcamp. What I can tell you right now is that the best way to learn how to code is to code. The thing about coding/programming is that it's this weird mix of a trade and an art. The only(or at least best) way to learn/get better is practice.