Ouais, j’suis con, pour ceux qui veulent avoir la solution:
Scoreboard scoreboard = Minecraft.getMinecraft().theWorld.getScoreboard();
String name = Minecraft.getMinecraft().thePlayer.getDisplayName();
ScoreObjective scoreobjective = scoreboard.getObjective("1");
if (scoreobjective != null) {
Score test = scoreboard.func_96529_a(name, scoreobjective);
if (test.getScorePoints() > 0) {
System.out.println("Score > 0");
}
}