<apex:variable var="cnt" value="{!0}" />    

<apex:repeat value="{!cases}" var="cse"> 

      <!-- apex:OutputText value="{!cnt}"/ -->

     <div style="{!if(cnt < 1, 'page-break-before:avoid;','page-break-before:always;')}">

     <apex:variable var="cnt" value="{!cnt+1}"/> .... .... </div> 

 </apex:repeat>