Computer Science and Engineering in USA

Dear Akshar, you must take both. Infact take TOEFL instead of IELTS if you plan to study in US. TOEFL OR IELTS are tests for English language proficiency. GRE on the other hand is the aptitude test testing your skills in reasoning, Mathematics and so on. Read more about the tests and understand the differences.
Best wishes

Hi Ramesh,
Of course, you can. You must check university websites for admission requirements and prepare. You must complete your bachelor degree before applying.