Please visit our website https://alphastar.academy/ and check out Curriculum and Courses menus. There is a good amount of information for you to make a decision for which course to register.
Please, note that there are diagnostics exams to determine your level more precisely.
For Math: https://alphastar.academy/alphastar-curriculum/math/#levels
For Computer Science: https://alphastar.academy/alphastar-curriculum/cs/#diagnostic