Use hyphen(-) instead of slash(/) or underscore( _ ) in Routes
You trying to create a dynamic routes which is not possible in codeigniter if you see the following flow chart of codeigniter you understand what i mean.
also you can see this chart in codeigniter official website
when you try to redirect or call some url it's work like this
Every request first goes to route there for you can't make it dynamic
Here is my solution, it is working for me, do like this.
$route['(:any)-Student-Search'] = "search";then in your link button, hopefully in your view, href the link like this.
href="/<?php echo $row->classname; ?>-Student-Search"the point is that not only you have to make your routes, also suffix it in your href link also the same way.