I know there's a lot of "how do I learn maths" questions out there but I wanted to lay down my history and interest to possibly get a better approach.
When I was in secondary school ( high school ) I was excellent at maths. For instance I remember figuring out the energy needed to theoretically split a charged particle using an electromagnet. It was probably incorrect and impossible but I knew enough to take a stab at it.
Nowadays I can't even remember how to do algebra or long division. I want to re-learn to a high enough level that I can do some hobbyist work with particle physics or space ( think NASA coding competitions, calculating orbits, etc )
So what would you recommend to refresh my memory on the basics and where should I aim to go for these goals (with respect to types of maths)? I tried digging out my old maths books but they're designed to be done over 5 years and I lost the interest after a few weeks.
Ideally I would like a crash course in the basics followed by some entry level physics books and some puzzle books to keep my interest. Any suggestions?
TL:DR - Best way to refresh on high school maths and move on to understanding physics formulae, specifically used in particle physics, orbits, space propulsion, etc?