Save data on custom table Wordpress

Here is my current code,

<div class="wrap">
<div id="icon-tools" class="icon32"></div>
<h2>Quote Manager</h2>
<div class="aio-content"> 
  <form method="post" action="options.php">
<?php settings_fields( 'mgg_aio_quote_manager_setting' ); ?>
<?php do_settings_sections( 'mgg_aio_quote_manager_setting' ); ?>
<table class="form-table">
  <tr valign="top">
  <th scope="row">Test</th>
  <td><input type="text" name="mgg_aio_quote_manager_setting_n" value="<?php echo get_option( 'mgg_aio_quote_manager_setting_n' ); ?>"/></td>
  </tr>
</table>
<?php submit_button(); ?>

</div>
</div>

    function mgg_aio_register_setting() {
  register_setting( 'mgg_aio_quote_manager_setting', 'mgg_aio_quote_manager_setting_n' );
}

add_action( 'admin_init', 'mgg_aio_register_setting' );

Everything works fine and my data gets saved under wp_options

My question is how could i make a custom table alongside wp_options and add all my plugin's options into it ?

My plugin is not under options page and has it's own top level page. The custom table should use prefix from wp-config. ({$wpdb->prefix})

Can anyone guide me here ? Is there any code available which I can include in my plugin to make it easier for writing and reading from db ?