You do not need to prove your English skills for study or work in America. You do not need to complete an English language requirement to get a USA study or employment visa. Although you may need to show your English language level to prospective schools companies you are applying to. Of course the higher your English skills the better your chance of being accepted in the school or company you are applying to. I teach students English based their needs and requirements, and I am happy to help you improve any or all of your English skills for your personal and professional success.