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LLM is the abbreviation of MasterofLaw, and it is a master's degree certified by the Ministry of Education. It is a master's degree provided by the United States for foreign lawyers, and fresh graduates (generally requiring a bachelor's degree in law) can also apply. This is what most people in China have applied for. JD is the abbreviation of JurisDoctor, and it is also a master's degree approved by the Ministry of Education. However, it has a three-year academic system and is an orthodox legal education in the United States. When applying, you must take the LSAT (similar to GRE, but it is one of the most difficult exams. If you don't know the meaning of GRE, you can ask Baidu Encyclopedia. American lawyers are the exams for the American lawyer's license, and every state in the United States has its own lawyer's license exam. Generally speaking, American bars are NYbar (new york Bar) and CAbar (California Bar). CAbar is generally a children's shoe that goes to school in California. NYbar can basically take LLM graduates from ABA-certified schools in various States because of its relatively loose application requirements.
3. The goal is clear, to improve GPA and IELTS scores. Generally speaking, a GPA of at least 3.3 is more competitive. At least it should be raised to 3.0. The requirements of IELTS general schools are all 7, and there are generally individual requirements. However, if you consider going to the United States, take a TOEFL test ~ IELTS scores are not accepted by some schools.
There are many masters abroad, depending on what you study. If your undergraduate major is not law, you can't apply for LLM basically.