Pre-algebra gives you the tools and foundations to use in higher maths as you get over, even working up to calculus and differential equations. Learning and mastering techniques in this broader math early will make solving tougher problems as you work your way through school significantly easier
I asked my friend if he had any Sodium Hypobromite
He said NaBrO
Why do I need calculus in real life?
Well, if you want to study anything in the engineering, math, architecture, medicine, coding, or even economics, calculus is integral (lemme just laugh at what I did there...) to all of these studies. As someone studying mechanical engineering myself, all of my classes expect me to know calculus. It's one of the biggest branches of math and in a lot of cases can make solving problems much easier.