There are many online resources for learning math and other subjects that are absolutely free of charge. Khan Academy is a great example of an online platform that can be used to study and practice math concepts.
Other than Khan Academy, there are many free resources online. Massively Open Online Courses are another free option; MOOCs are available from many top universities on the Coursera platform. These courses have set opening and closing times and often follow a strict schedule. However, those who are seeking college credit should turn to local colleges that offer online enrollment in math courses; these courses can range from costing several hundreds to several thousands of dollars each.