Credit score is not a thing outside of US. Sure if you borrowed something and you didn't pay you may land on some blacklist but usually nobody can see if you borrowed something and paid it without issue. Nor does anyone take it into account.

When you need to buy an apartment and have a job you go to the bank and the bank assesses if you earn enough to pay back the mortgage and if you do they pay for your new apartment which might be just being built.