Hello. If you want to pursue B.Ed, generally the teaching subject is given on the basis of what you studied as your undergraduate subjects or in post graduation.
NCTE has the criteria that you can choose the subjects that you studied in your UG for 2years. Or you must have done post graduation in that subject. Along with that one subject you can choose one language.
please visit official sites of particular colleges for seeing  the list of teaching subjects. Good luck!