This can happen, a friend of mine , with a complicated life, taught herself even physics from the course books, and she is (officially) an artist
so BBC bitesize, buy cheap (used) textbooks from amazon - I bought one (Biology?) with a CD/DVD interactive based teaching for about 5 pence with free postage, it is VERY hard to teach yourself maths, that does need a friendly expert to explain it to you.
make notes, plan, write to do lists, search outside of the google bubble - (oh and my arty friend graduated top of her school, having taught herself nearly everything) good luck, it can be done