I need to learn math. Am NEET brainlet who has forgotten how to even do a division or a multiplication with more than 2 digits without a calculator.

I remember being able to do some very basic algebra many years ago but everything is forgotten and I have a lot of brain fog.

I want to change my life for the better and it requires me to know at least college freshman levels of math.

I have until early march to learn everything, I have to do a couple exams by then.

Pls help, should I start with Khan Academy? Any YouTube channel you recommend? How do I get rid of the brain fog and recover the ability to remember things?