Let me talk about studying abroad first:
The sooner these things are prepared, the better. Generally speaking, there are two directions: 1, going to the United States for graduate study, taking TOEFL in language, taking gre (science and engineering) or gmat (economics) or lsat (law) or mcat (medicine) in entrance examination. 2. Go to Commonwealth countries, such as Canada, Australia and New Zealand, as long as you have passed IELTS. TOEFL and IELTS are valid for 2 years, and gre is 3 years. I don't think we should take the exam too early. When you apply to an American university, TOEFL scores will only be sent to the university you applied for, and gre will send your previous scores. So gre is best to pass once. You can apply to the school in advance, provided, of course, that you pass these exams. In addition, a successful application for a foreign university also requires a degree certificate and diploma from your domestic university. The professional achievements in the university will also have a certain impact on the application. Many websites have detailed explanations on how to test TOEFL, IELTS and gre. All you have to do is search online. It is also beneficial to study in New Oriental if conditions permit.
1. It's not too late to take the IELTS test, but you must get at least 6.5 points. The process is to apply for foreign universities with your IELTS score, your fair university transcript (with an average score of over 75), your fair diploma and degree certificate, a cover letter, a professor's recommendation letter and other materials. Then the notice arrived, prepared the materials for applying for a visa, and applied for a passport by the way. Materials include parents' income certificates and property certificates.
You don't need a special exam to change majors.
3. Choose a school You should choose the relevant school according to the major you want to study. To apply for a scholarship, first of all, your IELTS score is better, above 7.0. Moreover, your achievements in universities should be outstanding, and you should be more famous in domestic universities. However, the scholarship regulations of different schools are different. I suggest you refer to the information of each school.
It is generally better to apply three or four months before the start of school after choosing a good school, because it takes a lot of time to apply for a visa after applying for a good school.
You don't have to go through an intermediary, but if you don't know much about this, I suggest you choose an intermediary. After all, they prepare professional materials, and there will be many crooked ways to help you get a visa. However, you must be careful to be hacked when choosing an intermediary!