Thank you very much for your reply. I found an alternative way to achieve the solution.
STEP : 1
I REMOVED THE FOLLWING CODE FROM FORM.PHP
<div class="col2-set" id="customer_details">
<div class="col-1">
<?php do_action('jigoshop_checkout_billing'); ?>
</div>
<div class="col-2">
<?php do_action('jigoshop_checkout_shipping'); ?>
</div>
</div>
STEP : 2
I changed the validity of the fields from True to False in Jigoshop_checkout.class.php in class directory.
The main disadvantage is I can’t update the Jigoshop plugin but for y project it is not required.