Travel / Can a 15 year old ukrainian citizen travel from Poland to Ukraine alone? [3]

I'm 15 y.o. citizen of Ukraine and currently am studying in Poland. I want to travel to Ukraine, but I'm not sure if I'll be able to cross the border alone.

I've got a "child's travel document" with a Schengen visa for 1 year with unlimited entrance/exit. I've also got a "legitymacja" from my school and an isic card.

I've already called polish and ukrainian border guards, they say it should be fine, but nobody gave me any reference to the law, so I'm not completely sure I'm not going to be kicked out off the train at the border.

Study / Studying in Poland after 9th grade (for international students) [4]

Hello, everyone! I'm thinking about going to a college in Poland after 9th grade. I'm from Kiev, Ukraine and there are people here offering free education in Poland after finishing middle school (9th grade).

Here is one of the options: zs2 . pulawy . pl /

I'm trying to find some other schools, so I would be happy to hear some advice about education after 9th grade or maybe someone could recommend a nice place to study (I prefer anything related to programming and electronics).

P.S.
Can I go to any of these schools "nauka . gov . pl / en / higher-education-institutions / higher-schools-of-professional-education . html" after 9th grade and what about free education?

And what does ZESPÓ£ SZKÓ£ mean? Is it something different from Higher Schools of Professional Education?
Thanks a lot!