setElementData(localPlayer,"givePlayerExp",getElementData(localPlayer,"exprequired")+10)

<meta>
	<info author="WASSIm." name="Level System" version="2.2.0" type="script" />
    
    <script src="server.luac" type="server" />
    <export function="givePlayerExp" type="server" />
	<export function="takePlayerExp" type="server" />

<exprequired>
    <level Level="1" EXPRequired="25"></level>
    <level Level="2" EXPRequired="50"></level>
    <level Level="3" EXPRequired="100"></level>
    <level Level="4" EXPRequired="250"></level>
    <level Level="5" EXPRequired="500"></level>
    <level Level="6" EXPRequired="750"></level>
    <level Level="7" EXPRequired="1000"></level>
    <level Level="8" EXPRequired="1250"></level>
    <level Level="9" EXPRequired="1500"></level>
    <level Level="10" EXPRequired="1750"></level>
    <level Level="11" EXPRequired="2000"></level>
    <level Level="12" EXPRequired="3000"></level>
    <level Level="13" EXPRequired="4000"></level>
    <level Level="14" EXPRequired="5000"></level>
    <level Level="15" EXPRequired="6000"></level>
    <level Level="16" EXPRequired="7000"></level>
    <level Level="17" EXPRequired="8000"></level>
    <level Level="18" EXPRequired="9000"></level>
    <level Level="19" EXPRequired="10000"></level>
    <level Level="20" EXPRequired="12500"></level>
    <level Level="21" EXPRequired="15000"></level>
    <level Level="22" EXPRequired="17500"></level>
    <level Level="23" EXPRequired="20000"></level>
    <level Level="24" EXPRequired="30000"></level>
    <level Level="25" EXPRequired="40000"></level>
    <level Level="26" EXPRequired="50000"></level>
    <level Level="27" EXPRequired="60000"></level>
    <level Level="28" EXPRequired="70000"></level>
    <level Level="29" EXPRequired="80000"></level>
    <level Level="30" EXPRequired="90000"></level>
    <level Level="31" EXPRequired="100000"></level>
    <level Level="32" EXPRequired="200000"></level>
    <level Level="33" EXPRequired="300000"></level>
    <level Level="34" EXPRequired="400000"></level>
    <level Level="35" EXPRequired="500000"></level>
    <level Level="36" EXPRequired="600000"></level>
    <level Level="37" EXPRequired="700000"></level>
    <level Level="38" EXPRequired="800000"></level>
    <level Level="39" EXPRequired="900000"></level>
    <level Level="40" EXPRequired="1000000"></level>
</exprequired>

local xpNeed = 100; -- E.g. 100 * lvl = XP you need to rank up!
addEvent("onPlayerLevelUp", true);

function addPlayerXp(player, xp)
	local acc = getPlayerAccount(player);
	local oldexp = getAccountData(acc, "exp") or 0;
	local oldlvl = getAccountData(acc, "lvl") or 1;
	local newlevel = oldlvl + 1;
	local newexp = oldexp + xp;
	setAccountData(acc, "exp", newexp);
	setElementData(player, "exp", newexp);
	if (newexp >= (oldlvl * xpNeed)) then
		outputChatBox("[Level-Up] Congratulations! New level "..newlevel.."!", player, 66, 134, 244);
		setAccountData(acc, "lvl", newlevel);
		setAccountData(acc, "exp", 0);
		setElementData(player, "exp", 0);
		setElementData(player, "lvl", newlevel);
		triggerEvent("onPlayerLevelUp", player, newlevel);
	end
end

addEventHandler("onPlayerLogin", root, function()
	local acc = getPlayerAccount(source);
	setElementData(source, "lvl", getAccountData(acc, "lvl") or 0);
	setElementData(source, "exp", getAccountData(acc, "exp") or 0);
end);

local sX, sY = guiGetScreenSize();
local lvl = guiCreateLabel(0.5, 0.05, 0.5, 0.5, "LVL: 0 | EXP: 0", true);
guiSetFont(lvl, "default-bold-small");
local xpNeed = 100; -- E.g. 100 * lvl = XP you need to rank up!

addEventHandler("onClientRender", root, function()
	local thelvl = getElementData(localPlayer, "lvl") or 0;
	local theexp = getElementData(localPlayer, "exp") or 0;
	guiSetText(lvl, "LVL: "..tostring(thelvl).." | EXP: "..tostring(((thelvl + 1) * xpNeed) - theexp));
end);