My advice for high school and lower level college maths is to 1) pick a good book 2) solve all the problems. A good way to accomplish that well is to start at t

My advice for high school and lower level college maths is to 1) pick a good book 2) solve all the problems. A good way to accomplish that well is to start at the lowest math that is possibly non-trivial for you. Otherwise, you will hit a wall by skipping past your comfort zone and struggle, which is where you need an instructor to “save” you. You don’t want to build a castle on rocky foundations. It’s like lifting weights. If you start at a weight that is hard, you’ll probably struggle to learn good form.