Sophia, Waseda, Nagoya

Hello guys I'm currently a senior in Korea and I'm planning on applying the G30 program's for Nagoya's Auto-mech class, Waseda's Engineering class and Sophia's Green science class (These are the only classes I want to study out of the G30 programs). however I'm worried I won't be accepted to any of these universities because of my low scores (sat;1380 Sat2; mc2;800, physics;770, chem;680)
I know my sat scores are not terrible but what really gets me worried is my Gpa which is around 3.3. I was just not able to follow all the Korean classes after living a long time abroad and the school is really competitive. so do you guys think I actually have a chance with these following universities?
also I heard from somewhere that the universities accepted only a certain amount of Koreans due to so many Koreans applying.. Is that true?

G30 has ended in Mar 2013. G30 students in Mar 2017.
http://www.mext.go.jp/a_menu/koutou/kaikaku/1383342.htm
Some universities still use the word G30, Nagoya, but not in others, Sophia and Waseda.

You do not have to worry about GPA. All the three universities you mentioned do not use GPA, but SAT.
https://www.waseda.jp/fsci/en/admissions_us/
http://www.sophia.ac.jp/eng/admissions/info_Intls/binfo_ug
http://admissions.g30.nagoya-u.ac.jp/apply/#apply_7

I have not heard of such restrictions for Koreans. Although, now the number of students from Korea is the third, following China and Vietnam.
http://www.jasso.go.jp/sp/en/about/statistics/intl_student_e/2015/ref1...