What do I need to get Scholarship in Japan and if i get it. how can I start my life there.

I am 1st year high school and I found out that I can get scholarships in japan
I am aiming for YCU or a better university and tech industry
so what subjects do I need to focus on the most and how can I prepare myself if I ever got the scholarship

I am from Egypt attending normal STEM high School btw.