Hello,
Since you are in 11th and planning to study abroad with full scholarship, you should start preparing early. Focus on good marks, extracurriculars and English tests like IELTS or SAT. Countries like Germany and Norway have low or no tuition fees. For scholarships, you can check programs like DAAD and university based full scholarships. To know more details, Kindly check the below link.
https://studyabroad.careers360.com/articles/top-scholarship-programmes-study-abroad
I hope this helps you.