I sense quite a bit of hostility in your post, but it also shows me you are not aware of how educational systems in other countries.
In Brazil (as it is Australia, New Zealand, Malaysia or Singapore), the school year begins in January/February and ends in November/December.
We came here in July/15. My daughter had started 7th Grade in February/15. Upon arriving here, she had to re-start 7th Grade in September/15. That got her 6 months behind her homeland peers.
Now, once she finished HS here (June/21), she’ll be 1 and half year behind Brazilian students in general.
Then, again, the next school year in Brazil will only begin in February/22. By then she’ll 2 years behind.
Simple math, once you follow the logic (and know the differences in schools systems, of course).