First of all, whether to apply for visa exemption in Chinese depends on what kind of visa you are applying for. International students suggest using simple English. Your major should be junior college or above. After all, as an adult, you will use some English on your way to America, won't you? Secondly, the visa officer should answer that you have an immigration tendency and do not conform to American law. This is the most straightforward official answer. You need to thoroughly analyze the reason why you were refused a visa last time. You said you need to take a language class first, which is helpful to you. According to the information you said, it's hard to say whether you can sign it yourself. If you need help, welcome Baidu HI or ask me.