Admission into the M.S. program is based on a competitive combination of the following-
academic background
an adequate score on the Graduate Record Examination (GRE) where required. GRE is optional for MS applicants who received 4-year BS degree from ABET-accredited undergraduate programs in US institutes. GRE is mandatory for all other MS applicants. Texas law prohibits the definition of minimum acceptable scores on the GRE. However, 160 to 163 is a typical average score on the Quantitative section across all degree programs for an admission class.
letters of recommendation
the student's statement of purpose
Normally an undergraduate grade point average (GPA) of at least 3.0 out of 4.0 is required on the last 60 semester credit hours attempted exclusive extracurricular credits.

TOEFL- Internet based Test (iBT)- An overall score of 79 or higher.
Paper-based Test (pBT)- An overall score of 550 or higher.
IELTS score required is an overall score of a 6.5