Verb conjugation of "schwärmen" in German

I have been living in Holland for the last 14 years and I know the mentality very well. Holland is a small country, everybody knows everybody, so if we want to succeed, we must seize the opportunity.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
I am a kindergarten teacher for children between age 4 and age 5 and additionally I teach at a school here in Munich: music, painting and handicraft. At the moment just we have holidays.