JSFiddle - React, Tailwind, and code Playground

HTML

<table border="2" id="ctl00_ctl00_B_A_ucStudentRegistration1_TblTotalPay" class="TotalPay">
                            <tbody><tr>
                                <td class="caption">Total Amount</td><td class="caption">Paid Fees</td>
                            </tr><tr style="border-width: 3px; border-style: solid;">
                                <td>5889.2400</td><td><span disabled="disabled"><input type="checkbox" disabled="disabled" checked="checked" name="ctl00$ctl00$B$A$ucStudentRegistration1$chkMonth1" id="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth1"><label for="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth1">Month1</label></span></td>
                            </tr><tr>
                                <td>553.5000</td><td><input type="checkbox" name="ctl00$ctl00$B$A$ucStudentRegistration1$chkMonth2" id="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth2"><label for="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth2">Month2</label></td>
                            </tr><tr>
                                <td>885.6000</td><td><input type="checkbox" name="ctl00$ctl00$B$A$ucStudentRegistration1$chkMonth3" id="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth3"><label for="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth3">Month3</label></td>
                            </tr><tr>
                                <td>553.5000</td><td><input type="checkbox" name="ctl00$ctl00$B$A$ucStudentRegistration1$chkMonth4" id="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth4"><label for="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth4">Month4</label></td>
                            </tr><tr>
                                <td>553.5000</td><td><input type="checkbox" name="ctl00$ctl00$B$A$ucStudentRegistration1$chkMonth5" id="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth5"><label for="ctl00_ctl00_B_A_ucStudentRegistration1_chkMonth5">Month5</label></td>
                            </tr><tr>
                                <td>553.5000</td><td><input...

JavaScript

$('.TotalPay input[type=checkbox]').change(function(){
    var amount = $(this).parent().siblings().text();
    console.log(amount);
    alert(amount);
});