first I want to apologize for my bad English. I am a teacher at a secondary school in Germany. Some of these students specialize in computer science. Maybe I am the teacher of one of these courses next year The students have to learn these basic concepts in the first year: variables constants ...

I , though highly interested in computer science , due to some issues will not be able to join any computer science course in my undergraduate . So in order to get the knowledge and skill of btech undergraduate , what would be the books and problems solving resources from where one can self-study...