I haven't visited this site for a long time and saw your comments today. Thank you both to help me! :) Those examples you gave me are very good example to understand!

Tienen el mismo significado, son sinónimos. They have the same significance, they are synonyms

I think it's almost the same thing. The definition could vary according the countries (because of culture -way of speaking- or education system) but I think the main line to make a comparison between both is the following: -Escuela: Mainly refered to primary schools. It has some idea of state (public) school. But also used with any kind of stablishment related to teaching (for example: art school, music school, language school). Can be also used with secondary schools, and it's normal to use this word for high schools too in Argentina. -Colegio: In some countries is mainly used to refer to secondary school stablishments, and more related to private schools. Also used for institutes with specialized subject, for example: *Lawyers school (Colegio de abogados); *Engineers school (Colegio de ingenieros); *Architects school (Colegio de arquitectos). Those examples I said, probably, are not exactly related with teaching but related with some kind of civil representation of the professionals of the are, like a society. I think both words are used to talk about the primary and secondary (high school included) school, in MOST of cases, without difference. Hope to be helpful ;)