In most of the cases result withheld signifies your result is imcomplete, this happens because may be your college sends 0 marks out of your internal marks or can also happen if in a Semester you are unable to attend all the exams. So they can't consider your case as fail. Considering the level in which you study whether college or 10+2 contact your designated Institute to clear your doubts and know in details how you can get a complete result.

Good luck!!