Hi,
There's 2 math modules, 1 fundamental econs, shipping econs, and some other modules which might require calculations here and there.
Believe me, I also hate these modules

I was from Poly, so as compared to JC students, I had much more problems with the math modules. But if you have A-math during your secondary school, I believe there is still a chance to ace it - which I did not manage to. HAHA! If you did not have any A-math background, it will be quite hard to learn. This is due to the short lecture and tutorial hours. But you can arrange consultation with the lecturers!
For Econs, I felt that it is quite manageable. Most of the concepts are more logical like 'when you have better technology, you produce more, and your supply increases' etc. As compared to E-math, I would say that econs is more logical and easier? I think?
Hope that my answers are what you are looking for