What are the exercises to reduce excess fat on upper arms?

The best exercise is pushing away from the table. Sorry, but you can't spot reduce. In order to lose fat in a particular place, you have to lose fat all over. That means cleaning up your diet as well as working out.

If you want good arm exercises, then try dips, press-ups, and pull-ups.

A fun exercise which really works the arms and burns calories is pole dancing. You'll be amazed at the way it hits your arms.