1.SAT, no.
2. You need the results of EJU. It's not that hard. The difficulty of Japanese is between grade one and grade two, and the difficulty of liberal arts/science and mathematics is actually below the college entrance examination. However, it may be difficult to get at least 90% or more points to be competitive enough to ensure foolproof.
3. TOEFL requirements are not high, and more than 80 points is enough. Of course, if you can get more than 90 or even hundreds, your impression will be better.
4. It is not very important whether high school is the key point of the city, but high school grades should be kept at a high level as far as possible, and beautiful transcripts can also increase goodwill.
Shanghai hukou is more favorable in visa, which is an advantage. If it's difficult for you to take the examination of Dongda University directly after graduating from high school, you can also go to a Japanese language school to strengthen your language for about half a year (China graduated from high school in June and started the Japanese university examination at the beginning of the year). By the way, you will be more comfortable during the exam.
Finally, although the above is not very difficult, it is only compared with the super-class in the United States such as Harvard, Yale and Princeton. Those who are admitted to Dongda University are still absolute elites, so don't relax your efforts in the next few years. Possibility is in your own hands, no matter what others say, it is just a reference.
Good luck with your studies.
Interpretation is not the same as TOEFL, but it is not too difficult to score above 80 in senior three.