This is for the author of the post,
1) if you are planning doing GRE, and since your field is related to engineering, try to get over 97% in Mathematics and analytical papers. Don’t worry too much over Language.
2) Prepare an impressive "personal Statement" describing why you want to study in particular subject. Try to elaborate on a specific theoretical/applied problem of the field you are interested in finding answers
My other suggestion is to try NORWAY, FINLAND, GERMANY and SWEDEN for a PhD degree in engineering. These countries have a higher standard of living, excellent education and cultures which respect diversity