change your environment: go to a different room or even just look out a window for a few minutes. think of a color and try to find 5 things around you that are that color and say what it is out loud. works for a letter as well pick a letter find 5 things around you that begin with that letter and say them out loud.
breathing exercises:
1: count your inhales/exhales in your head up to 10 and back again... example "in 1..out 1, in 2 out 2..."
2: this one is good but harder to explain. using your thumb and first finger. place your thumb on the side of your right nostrils (closing the airway) breathe in through your left side. then put your finger on the left nostril and breathe OUT through your right, inhale through the right, thumb to the right side, breathe out your left... and so on for a few moments ... hope that was explained well enough
3: breathe into your belly... untighten your belly and breathe in deep hold for a second then slowly let it out repeat....
those are a few that are relatively easy, hope this helps