You didn't say which part of mathematics you want to study or what is you previous knowledge.
For
algebra see these courses:
On
The Open University you can find even more courses and
on this site you can find links to a lot of online resources for algebra (lessons, tutorials, games, problems...).
For
calculus I recommend:
And if you have questions or you don't understand something you can ask
here.
I hope I helped you :)
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