-Series/Proofs

-Complex Numbers

-Polar Co-ordinates

I tend to just stick with pre-algebra and algebra. I don't really understand what belongs in this forum. With the english education system, "after trig but before calc" means nothing at all. We don't learn things in that order. Is that even what it's referring to? I've never really understood it. I'm probably being naive; it could be an international thing, but it's that which confuses me. I don't see what it defined as being "after trig", for example.