I have done my post graduation in Education and Mathematics from India. Which course can i opt for related to my field and from which university ? Am i qualified for opting Phd in Education or Mathematics ? What are the pre requisites of the above said courses ?
Education in USA gives you full choices. You can change your field, if you want to and do PhD or masters in your field of choice. You can apply for PhD in Education or Mathematics. Depending on your current education the school you apply to will suggest you the pre-requisites. It all depends on the school you apply to and we cannot really say the list of pre-requisites. Read Change Major or specialization in USA