How do you find data science internships?

I am a high school student (grade 12) in a EU country, and if I do well on the national entrance exams, I'll get to the best university in the country which is in the top 200-250 for CS - according to QS.

My experience with programming/data science is with Kaggle (for the last 2 years), having participated in 10+ competitions (1 bronze medal), and having ~4000 forks for my notebooks/codebases.

Starting with university, how and when should I look for internships (preferably overseas because my country is lackluster when it comes to tech, let alone AI). Is there anything I can use to my advantage?

What did you guys do when you got your internships? Is it networking/nepotism that makes the difference?