A good trick that you can’t hit consistently is not a good trick to use on stage.
Mistakes cost you double. You lose the potential points of the trick you missed and get negative points for the mistake.
NEVER switch yoyos unless you absolutely have to.
Learn how to push/snap start your yoyos. Winding up a yoyo on stage is a waste of valuable time.
Read the rules of the contest you’re competing in, read them again, and then explain them fully to a friend. Understanding how you will be scored is critical when competing.
Study your tricks and find places you are likely to mess up. Learn how long it takes you to get out of the most common mess ups and how you can get back into a later part of the trick while still maintaining timing to the music.
Wash your hands ten minutes before you go on stage.
Get sweaty hands? Use gloves or deodorant spray on your hands.
Preferably own three of the same yoyo to use in competitions. Using two different yoyo can lead to serious issues and less consistency if you switch.
Keep your yoyos well maintained. Put in a new pair of pads and put on a new string before you compete. Triple check that your strings are knot free before going up on stage.
If you’re not an experience competitor, don’t improvise on stage. Go through your performance at least twenty times before you compete.
Hope for the best, but prepare for the worst.