There isn't any direct bias towars any specific type, just a slight, but noticable, preference towards ESTJ and similar personalities. Its not that people literally, conciously prefer these types, it sjust in the way things are set up. For example, schools are set-up in a way that clearly prefers E's (sticking a bunch of kids in a classroom), generally leans towards an S appraoch (by putting all the lessons in a very step-by-step approach. Let me say that more than once I didn't understand at all what was being taught untill the final step was shwon and it instantly, and intuitively, clicked together). The T approach kind of goes without saying, the majority of classes try to do objective, logical analysis. Some classes have more balance, such as Law, and some classes should, but don't have a good balance, such as English (which at my school seems more TJ than FP, and I think it needs to be balanced in English especially). The J preference is in the various structures -class structure, lesson plans, writing formats, ect.
So, its not like its a system where only ESTJ's can work, but there certainly seems to be a subtle preference for that, and I think that it is most unfortunate in English class, because instead of really looking at language and what can be done with it, both in terms of objective anlysis and creative anlysis and creative writing, we are instead taught to write using specific formats about specific topics from a list. That doesn't even feel like education, thats more like skill building -a format can be learned pretty easily without a teacher, but developing ideas is something that is better to be taught in schools, how to develop and illustrate ideas. That can be done without schools, but it seems best to work on it in schools. Writing formats are superficial in terms of education, they don't really add anything to the writing and are worhtless as far as I'm concerned. They shouldn't even exist.
General society has a similar slight preferance for ESTJ, simply because more people posses those traits (be it individually, or in pairs, such as being TJ or ET or ES, ect, or being the full ESTJ). Also, the people who run and organize most things, the poeple in power, are generally in that realm as well.
But... here in Canada I guess the J-P line is more ambiguous. A lot of our great leaders have been P, I think, and we are generally very liberal in terms of rights... so maybe its more like ESTX. I still don't think we are really all that F -we are probably more F than the U.S., but we are probably still T dominated in terms of our leadership. The U.S. come soff as super TJ in terms of how its run, but Canada is more F and P, but still more T than F (maybe 60 for T and 40 for F). This is in terms of the governemnt, the political parts of the countires, and what politicans do, not so much the common people and every day society.