Math would only become more difficult to those without the right background, cause math builds on itself. Well, maybe that's true to an extent. Anyway, what I mean is the procedures can be tough to remember - along with the background math to do it. For instance, even if you knew prerequisites (algebra, basic integration etc..) well - it could be tough to remember every step in the various types of disc integration.I think in context of research and the engineering topics. I do think math becomes difficult as we move ahead. And for those who want to be less on theory side, they tend to find difficult. I am more of hands on type person during engineering studies. So I had that issue with the maths while studying engineering.