2. Of course, it is best to study in Japan, among which Kyoto Seibu University is the most famous! The best domestic media, North Film, Gome, Shanghai University, Nanjing Normal University, Zhejiang Chuan, Tongji University, Southeast University, Anmeiyuan and Nanyi should be North Film.
3. The basic element of success is persistence.
It depends on the specific school. As for the second major, it means double degree. Basically every school is allowed to take double degrees. As for some schools that restrict the majors that art students can choose, it means that every school is different. Most schools have no restrictions. You want to study any other major, but only if you don't fail the first major and you study hard, otherwise you won't get the qualification for the second major. As for choosing this kind of thing, every school will have public elective courses every semester. Reach a certain credit, there are all kinds of courses, and grab whatever you want. But to be honest, if you want to choose a second major, there is really no need to choose an art major. If you go to a liberal arts university, the art major of this university will definitely not be high-end, and it will be fun to learn basically. I think it is more reliable to choose two majors in media, which is one of the ways to save the country by curve.
Also, you can really insist, you can take time to study in a professional school, and there are plenty of schools outside that specialize in teaching animation.