Finland

0-5 year olds Kindergarten (voluntary)

6 y.o.'s pre-school (mandatory since 2018)

Grades 1-6 in comprehensive school are called “low school” (mandatory) Grades 7-9 in comprehensive school are called “high school” (mandatory)

Second degree years 1-3 (mandatory since 2021), you choose either “upper secondary (gymnasium)” or vocational school (or both).

And if you wish to study further university/uni of applied sciences. Basically everyone does their masters (3+2 years) if they choose uni. Uni of applied sciences is usually 3 years.