arrGradeChanger.js

// ==UserScript==
// @name       ARR Grade Changer
// @namespace  http://zacharyguard.co.nf/
// @version    0.1
// @description  Changes all of your grades below B to a B
// @include      https://*.tg.esf.edu.hk/src/module/arr_parent/*
// @copyright  2014+, Zachary Guard
// ==/UserScript==
var tds = document.querySelectorAll("td:not(.arr_indi_borderR)");
 
for(i=5;i<tds.length;i++){
    if (tds[i-5].textContent.indexOf("Science") == -1 && document.body.innerHTML.indexOf("Biology") == -1) {
        if (tds[i].textContent.charAt(0) > "B" && tds[i].textContent.replace(/\s/g,"").length <= 2 && tds[i].textContent.replace(/\s/g,"").length != 0) {
            tds[i].textContent = "B";
        }
    }
}