/scoreboard objectives add Admin dummy

testfor @a[score_Admin=(Number 1 less than Admin number),score_Admin_min=(Number 1 more than Admin Number),m=1]

gamemode 2 @a[score_Admin=(Number 1 less than Admin number),score_Admin_min=(Number 1 more than Admin Number),m=1]

testfor @a[score_Admin=2025,score_Admin_min=2027,m=1]

gamemode 2 @a[score_Admin=2025,score_Admin_min=2027,m=1]

/tellraw @a[score_Admin=2025,score_Admin_min=2027,m=1] {"text":"","extra":[{"text":"Creative is not allowed","color":"white","italic":"true"}]}