unable to get data through result()

In your model:

class Select extends CI_Model  
  {  
     public function select()  
     {  
        //data is retrive from this query  
        $query = $this->db->get_where('categories',array('category_name'=>'English')); 
        // you should return result() if the result contain multi rows, or row() if you want only one row.
        return $query->result();
     }  
 public function topmenu()
 {
  $qry=$this->db->get('categories');
return $qry->result();
 }
  }  
?>

In your view:

<?php 
//foreach($top->result() as $m)
foreach($top as $m)
{ 
echo "<div class='panel-body'><a href='#'>". $m->category_name ."</a></div>";
}
?>

<div class="panel-heading">CATEGORIES</div>
<?php 
//foreach($cat->result() as $c)
foreach($cat as $c)
{
echo "<div class='panel-body'><a href='#'>". $c->subcategory_name."</a></div>";
}
?>
</div>