2. How to ensure the effect of combined training! This depends on the content of the course, the ability of the tutor, and your own comprehension ability! Of course, if there are small classes and large classes or 1 to 1 tutoring, there will definitely be differences.
3. Cost-effectiveness As I commented above, people who plan to study abroad may not be too short of money, but they should be more detailed. I think it's a bit uneconomical to give the organization 10W or 20W before going out! If you have the ability to DIY by yourself, so much the better!
If you apply to an American art school, it is recommended to know about psone's art study abroad. Their annual quota application system and portfolio counseling courses in American universities are very bright. If you look at major brands, you can refer to ACG, and if it is a European country SFK, you can also consider it.