[Omer.]

Use PVars

Код:

SetPVarInt(playerid, "CheckpointStatus", 1);
GetPVarInt(playerid, "CheckpointStatus")
DeletePvar(playerid, "CheckpointStatus"); // when you want to set it to 0

server destroys PVar when player disconnected.

Tutorial: https://sampwiki.blast.hk/wiki/Per-player_variable_system