Need help with Pre-Calculus

Hi,

I am going to have pre calculus in a couple of months and I was wondering how I could prepare. I have a weak memory of algebra 1 and algebra 2.

Should I learn the entirety of algebra again on khan academy? Or is khan academy's "Get ready for precalculus" course enough? It has algebra.

https://www.khanacademy.org/math/get-ready-for-precalculus

I want an A in pre calculus.