How i make a script check for a group rank and destory gui if not in group and certain rank?

I'm glad you asked this question! It can be hard to figure these things out if you don't know where to look. That's why, I am going to tell you to look here. I recommend reading through the whole page, just to see what tools are at your disposal, but under the YieldFunctions, you should find a very useful GetRankInGroup function.

To use any of the functions on that page, you will need to use the : with the () after. PLAYER:GetRankInGroup()

Also, some of the functions take parameters you can find out by clicking on the function. GetRankInGroup has 1 parameter, and that is the ID of the group you want to know their rank in.

PLAYER:GetRankInGroup()

Example script:

repeat wait() until game.Players.LocalPlayer; --Wait for LocalPlayer to load
local player = game.Players.LocalPlayer
local groupID = 3
local rankNumber = PLAYER:GetRankInGroup(3) --This function returns the number rank of the player in the group with groupID = 3

if rankNumber > 200 then -- If their rank exceeds 200
	GUI2Remove:Destroy() --Put the code to destroy the Gui in here.
end