Is there any functions or escape sequence to go back from the previous line in the console screen?

Nope. You'd have to use a library or system specific functions for that.

May I know what libraries have it?
System functions are blocked by the administrator at school so I can't really use them.

System functions are blocked

That's impossible. Otherwise, nothing would work.

If you want to use a library, you can Google PDcurses or ncurses, but if you don't care about portability and are just trying to do something simple, like putting characters on the screen, system calls are usually a quicker solution.

I mean functions like system("cls") wouldn't work.

That's not what a system call is.
http://en.wikipedia.org/wiki/System_call
Example of system calls include Windows' CreateFile() and UNIX's fork().

Well, I don't know about those things.
Logically, I just called it a system functions because it's a function and the function name is system.

I just need solution that will not use things like system("cls") or any system(/*blabla*/).
I'll try to mess up with ncurses as you recommended.

you must use gotoxy ( column , renglón ) ;

Windows
http://www.cplusplus.com/forum/beginner/4234/#msg18563

Linux
http://www.cplusplus.com/forum/general/23269/#msg121845