HS drop out here. Looking to get A levels in UK as in my country I'd have to do everything linearly to get anywhere close to university. I'm learning mathematics and am seriously considering studying mathematics or a field related to it in university, however, how does one go about self teaching mathematics from the absolute basics? I'm going through and most of it is somewhat back in my head as I remember doing basic algebra, geometry and some trigonometry, but like I said, I'm almost a clean slate. Has there been anyone in similar situation as me? It seems very easy to be discouraged consider how much time has already been lost, however I am also very determined to see my goals meet my ends.

And no, I'm not a retard. To explain my situation, I'm also working nearly 70 hour weeks, but my schedule gives me lot of free time to study, which is a big part of the reason why I even started studying.

To ask more conrete questions, I am wondering how to:
>deal with gaps of knowledge effectively? Everytime I learn something new I realise there is something missing, so for every step forward there are at least two steps back.
>plan my studies? Any good websites with learning materials following their best logical order? I'm currently going through /sci/ wiki, but advice is always welcome as it cuts time planning and allows more time for actual studies.