First of all, just to be clear, you don't need to kill yourself to have a huge amount of score points. In order for you to get a "High Score", it's not world or server, it's yours, it means only 10 points or 5 or anything can be enough.
In order to get a High Score, you need to complete ALL game MODES, at least once
You can change game modes by pressing R1 button (100 Meters; Hurdles; Triple Jump; Multisport modes)
In case of How to Play Golf (3Holes; 9Holes; 18Holes), you don't need to get all modes, just finish one of them.
The game finishes when this screen appears:
In case of How to Play Golf (3Holes; 9Holes; 18Holes), you don't need to get all modes, just finish one of them.
The game finishes when this screen appears: