Hi Tenhik,
I've done much less intense economic coursework, and next year I'll be at CEMFI. They do a september math camp AND a math course during first term, where they cover all the usual stuff, up to some PDE and dynamic optimization I think. During first term, you also have math stat (intro to econometrics), and you start the "real" econometrics only in the second term. For this reasons, I would say that you should go straight from ug, and don't worry too much :) If you understood diff. equations and had graduate econometrics and macro/micro, you won't have more problems than me, be sure :P