Menu with active class (click/scroll) JavaScript

the code works fine, but I need help to make some improvements or just optimize JS code.

1. if I am in #item1 and press to go to #item6 add .active class to #item6 instead of add .active and remove from #item1 … #item2 … #item3 … until I get to #item6

2. when i am in #item6 and I use scroll not click to go to #item5(or #item4) remove .active class from #item6 and use default scroll to .active

Hope you understand me. Sorry for my English. Thanks.

        <header id="header">
            <div id="header-menu">
                <ul class="menu">
                    <li><a class="menu-item-1" href="#item1">Item1</a></li>
                    <li><a class="menu-item-2" href="#item2">Item2</a></li>
                    <li><a class="menu-item-3" href="#item3">Item3</a></li>
                    
                    <li class="centered-logo no-padding">
                        <a href="#home">
                            <img class="logo" src="images/logo.png" />
                        </a>
                    </li>
                    
                    <li><a class="menu-item-4" href="#item4">Item4</a></li>
                    <li><a class="menu-item-5" href="#item5">Item5</a></li>
                    <li><a class="menu-item-6" href="#item6">Item6</a></li>
                </ul>
            </div>
        </header>

$( document ).ready(function()
{
    $(window).scroll(function()
    {
        var Scroll          = $(window).scrollTop() + 1;
        SectionOneOffset    = $('#item1').offset().top;
        SectionTwoOffset    = $('#item2').offset().top;
        SectionThreeOffset  = $('#item3').offset().top;
        SectionFourOffset   = $('#item4').offset().top;
        SectionFiveOffset   = $('#item5').offset().top;
        SectionSixOffset    = $('#item6').offset().top;
        
        if (Scroll >= SectionOneOffset) { // If you have scrolled past section one do this.
            $(".menu-item-1").addClass("active"); // Adds class of current-menu-item to the menu item with a class of menu-item-1
        } else { // If you have not scrolled section one do this.
            $(".menu-item-1").removeClass("active"); // Removes class of current-menu-item to the menu item with a class of menu-item-1
        }
        
        if (Scroll >= SectionTwoOffset) { // If you have scrolled past section two do this.You can duplicate this for as many sections as you want.
            $(".menu-item-2").addClass("active"); // Adds class of current-menu-item to the menu item with a class of menu-item-2
            $(".menu-item-1").removeClass("active"); // Removes class of current-menu-item to the menu item with a class of menu-item-1
        } else { // If you have not scrolled section two do this.
            $(".menu-item-2").removeClass("active"); // Removes class of current-menu-item to the menu item with a class of menu-item-2
        }
        
        if (Scroll >= SectionThreeOffset) {
            $(".menu-item-3").addClass("active");
            $(".menu-item-2").removeClass("active");
        } else {
            $(".menu-item-3").removeClass("active");
        }
        if (Scroll >= SectionFourOffset) {
            $(".menu-item-4").addClass("active");
            $(".menu-item-3").removeClass("active");
        } else {
            $(".menu-item-4").removeClass("active");
        }
        if (Scroll >= SectionFiveOffset) {
            $(".menu-item-5").addClass("active");
            $(".menu-item-4").removeClass("active");
        } else {
            $(".menu-item-5").removeClass("active");
        }
        if (Scroll >= SectionSixOffset) {
            $(".menu-item-6").addClass("active");
            $(".menu-item-5").removeClass("active");
        } else {
            $(".menu-item-6").removeClass("active");
        }
    });
});