I am a Cs Student, enthusiastic about programming. C is my first programming language that I learned. (Never been exposed to programming, data structures, algorithms before) I failed the exam because I studied on my own and didn't know how to use windows non standard libraries like conio.h. (I had to draw circles, etc using get x and get y). I told them but they just don't care.

What do I do because for a beginner this is very confusing? Do I continue to study ansi c on my own, or should I study non standard c? Should I do them in parallel?

*I did use the search bar but found nothing useful that could help me.