I don't know yet how to make these kind of scripts because I never saw one (only in servers).
Ill give you example of what I need:
Player1 KILLED Player2
Player1 will gain 5 EXP
Player2 will lose 10 EXP
Here's the command you might need:
1
cs_exp[id]=cs_exp[id]+5
1
cs_exp[id]=cs_exp[id]-10
Don't forget to change the 'id' to what you're using o.O