/sci/ - Science & Math

TL;DR
I am uneducated pleb. How do I start learning basics of math.

Hello, /sci/.

When I was a child, I was naive and silly. I thought studying math would be pure waste of time, because my profession is not going to be related to it at all. So after 5th grade I started to slowly skip homework, and listening to teachers. In 10th grade I was not listening math teachers at all, if I attended the lessons at all.

As grew, however, my perspective on life have changed, and I was no longer interested in profession I've chosen years ago. Now I actually need math to pass exams to get to a uni.

Is there any resources that I can use to fill gaps in my knowledge and learn what I don't know yet? Any online courses or books?