2. After the college entrance examination, you want to go directly to Northern Europe for undergraduate study.
The reason for this understanding is that "studying abroad" usually means that the country has completed a complete undergraduate or postgraduate study; However, if you want to study abroad for a short time during your undergraduate course, it is generally called "exchange" or "communication"
For the first case:
Many universities in China have exchange opportunities with Nordic universities, such as the National People's Congress, Peking University and Zhejiang University. Others, such as Zhengzhou University, also have such projects. If you must determine which universities have this opportunity, I suggest you choose a Nordic university, such as "exchange in Stockholm University, Sweden" as a keyword in Baidu search, and you will see many university web pages links, all of which are the selection notices of exchange students in this school. We can know which schools in this university have exchange programs. Your question involves too many schools, so I can't give you a comprehensive answer, I can only provide one method.
As for preparation, the university will get a TOEFL or IELTS score. Many exchange students in China University pay attention to the following aspects:
1 TOEFL/IELTS score;
2 GPA is also an academic achievement in college.
Some schools have interviews.