Hi it depends where you live and what native English speakers you have had as teachers. Some words are different and you only need to look up the websites you have been given. Here British English is taught.

Here is a web site that explains the differences much better than I can. http://www.google.ca/search?q=American+English+and+British+English%2C+which+is+more+popular%3FAnd+what+differences+are+between+them%3F&rls=com.microsoft:en-US:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GGLL_en&redir_esc=&ei=5XiqS4uiHML78Ab4m4y8Bw

British English still has a slight lead in popularity, since it is taught in more places where English is not the mother tongue. If you count India, the lead may be more considerable. However, American English (for better or for worse) is gaining fast. This is because of America's current status as a leader in business, as well as the fact that so many movies and TV shows are exported from the U.S. As for the differences, there have been whole books written about that. Try these sites: http://en.wikipedia.org/wiki/American_and_British_English_differences http://www.uta.fi/FAST/US1/REF/usgbintr.html