General interests in a field are fine, but you will have to be more specific in your Statement of Purpose in each application, so start focusing your interests now. Some schools will not let you defer entry after acceptance, so also be sure that you want to go to school the following year. To find out more about a particular field, go to the library and read journals or look up articles on the Internet which have been written by the faculty at your intended graduate schools. Graduate school is where you will establish important contacts for the rest of your profession. It is helpful to apply to schools in a part of the country where you would like to stay, and to study with individuals in a department with whom you want to exchange ideas for some time.
Writing is emphasized in graduate school much more than verbal participation.
Research papers will be expected, which are vastly different than those written for St. John's classes. You will be at a disadvantage as far as style in the beginning, but once you learn what the professor is looking for your St. John s communication skills can be brought to bear. You will most likely have an advantage over other students in these discussions. Assess yourself as a candidate. Know your grade point average since most schools have a minimum GPA that they will accept.