Depending on the language of instruction at your university and the elementary, middle, and high schools you attended, you might or might not be required to provide evidence of your current level of proficiency in English. Usually for a US institution the TOEFL will be expected. Many will also accept a score from IELTS. Some will offer other options for demonstrating your proficiency.
If your education has not been in English, please do not confuse the level of English you have from conversing with family at home, reading the occasional novel in English, or watching movies in English, with the level of Academic English you will need for success in graduate studies. You might find it necessary, not just advisable, to enroll in an Academic English program before applying to graduate school. If money is tight, Academic English could be a good thing to study at a community college. For example, the CC where I teach Academic English would consider you an in-district student for tuition and fees if you have lived and worked in district for at least 3 months and can show that you have provided for more than half of your own expenses for the past 12 months.