JSFiddle - React, Tailwind, and code Playground

HTML

<body onload="script1();">
    Please check the box if you took a course in the respective subject in that semester.
<table width="200" border="1">
  <tr>
    <th scope="col"></th>
    <th scope="col">8th Sem 1</th>
    <th scope="col">8th Sem 2</th>
    <th scope="col">9th Sem 1</th>
    <th scope="col">9th Sem 2</th>
    <th scope="col">10th Sem 1</th>
    <th scope="col">10th Sem 2</th>
    <th scope="col">11th Sem 1</th>
    <th scope="col">11th Sem 2</th>
    <th scope="col">12th Sem 1</th>
    <th scope="col">12th Sem 2</th>
    <th scope="col">Select All Semesters</th>
  </tr>
  <tr>
    <th scope="row">History</th>
    <td></td>
    <td></td>
    <td><input name="AG[]" type="checkbox" value="A9Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="A9Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="A10Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="A10Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="A11Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="A11Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="A12Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="A12Sem2"></td>
    <td><input type="button" name="CheckAll" value="Check All"></td>
  </tr>
  <tr>
    <th scope="row">English</th>
    <td></td>
    <td></td>
    <td><input name="AG[]" type="checkbox" value="B9Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="B9Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="B10Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="B10Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="B11Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="B11Sem2"></td>
    <td><input name="AG[]" type="checkbox" value="B12Sem1"></td>
    <td><input name="AG[]" type="checkbox" value="B12Sem2"></td>
    <td> <input type="button" name="CheckAll" value="Check All"></td>
  </tr>
  <tr>
    <th scope="row">Mathematics</th>
    <td><input name="AG[]"...

JavaScript

function selectAll(a,b) {
var checkies = document.getElementsByName('AG[]');
for (var i = a;i < b;i++) {
    checkies[i].checked = !(checkies[i].checked);
    }
}

function script1(){
var el = document.getElementsByName('CheckAll');  // get all elements with that name="" attribute
el1 = el[0];  // get the first element (in this case, being the only one)
el2 = el[1];
el3 = el[2];
el4 = el[3];
el5 = el[4];
el6 = el[5];
el7 = el[6];

// now we have an element to call the method on

addEvent(el1, 'click', function(){selectAll(0,8)},false);
addEvent(el2, 'click', function(){selectAll(8,16)},false);
addEvent(el3, 'click', function(){selectAll(16,26)},false);
addEvent(el4, 'click', function(){selectAll(26,34)},false);
addEvent(el5, 'click', function(){selectAll(34,44)},false);
addEvent(el6, 'click', function(){selectAll(44,52)},false);
addEvent(el7, 'click', function(){selectAll(52,60)},false);
}

function addEvent(el, event, callback, bubble){
    if(el.addEventListener)
        el.addEventListener(event, callback, bubble);
    else if(el.attachEvent)
        el.attachEvent('on'+event, callback, bubble);
}