USA

Dear Harika!
I don't understand that for which problem you are talking about. I think that you are afraid of the change in the stream from electrical to computers. Right? So dear, I want to clarify that there is no harm in changing the stream from UG to PG. You are absolutely eligible (provided you must have to fulfill other conditions also). However, your visa investigation officer may ask about this question. And trust me, you must have to convince him with your answer. You may face this (that why you want to change your stream?) in US's university application form. So be prepared for the answer. Otherwise, all is well.
Kindly upvote the answer if you are satisfied.
Ask any query anytime!
Good wishes!

The Graduate Record Examination (GRE) is a standardised test that is required to be taken by students seeking admission to graduate schools. The exam has been developed to evaluate the verbal, analytical and mathematical skills of the candidates. GRE is a computer-based test and has a user-friendly design. Individuals applying to graduate schools in order to pursue a Masters of science (MS) or MBA are required to take the exam.
GRE also has subject tests, apart from the basic GRE exam. These subject tests help to make your application stand out from the rest by highlighting your subject knowledge and skill-level of a particular subject. Each subject test is intended for those students who have a Bachelor's degree in the particular disciplines. The subject tests being offered currently are Biochemistry, Biology, Chemistry, Literature, Mathematics, Physics, and Psychology.