You'be posted in the Lounge, a general discussion forum not set up for technical support. Please provide the name of the software program you're using, and we can get this question moved to the appropriate software support forum.
In most cases, I've found that dragging to rotate is most effective if you are dragging as far away from the pivot point as possible. Sometimes it's also easier to click in the text entry field for the rotation value, and use the up/down arrows to adjust. This may vary depending on the program you're using.