I'm trying to add pagination to a page that uses a Standard controller and an extension. When I try to use something like:

Page: <apex:outputText value="{!PageNumber} of {! CEILING(ResultSize / PageSize) }"/>

I get the error Error: Unknown property 'Client_Tracker__cStandardController.PageNumber'
I guess it doesn't work because I need to tell it to check the extension and not the Standard Controller but I'm not sure how. 

Controller Code: 

public class Client_PublicAccessTestsLists_Controller {
    private List< Forms_Evaluations__c > publicAccessTests;
    private Client_Tracker__c clientTracker; 
    
    public Client_PublicAccessTestsLists_Controller(ApexPages.StandardController controller) {
        this.clientTracker= (Client_Tracker__c)controller.getRecord();
    }
    
    public List<Forms_Evaluations__c> getpublicAccessTests()
    {
        RecordType rt = [SELECT Id FROM RecordType WHERE DeveloperName = 'Public_Access_Test' AND sobjecttype = 'Forms_Evaluations__c' LIMIT 1];
        publicAccessTests = [SELECT id, Name, Status__c, Date__c, Client_Tracker__c FROM Forms_Evaluations__c WHERE Client_Tracker__r.id = :clientTracker.id AND RecordTypeId = :rt.id ORDER BY Date__c DESC];
        return publicAccessTests;
    }
}

Visualforce Page:

<apex:page standardController="Client_Tracker__c" extensions="Client_PublicAccessTestsLists_Controller">
<apex:form >
 <apex:pageMessages />

<apex:pageblock id="CustomList" title="Public Access Tests List">
   <apex:pageBlockTable value="{!publicAccessTests}" var="pat" rendered="{!NOT(ISNULL(publicAccessTests))}">
        <apex:column headerValue="Action" width="60px">
            <apex:outputLink value="{! URLFOR($Action.Forms_Evaluations__c.Edit, pat.Id, [retURL=pat.Client_Tracker__c]) }" target="_top"
            style="color:#015ba7;">
                Edit
            </apex:outputLink>
            <span style="color:grey;">|</span>&nbsp;
            <apex:outputLink value="{! URLFOR($Action.Forms_Evaluations__c.Delete, pat.Id, [retURL=pat.Client_Tracker__c]) }"
            style="color:#015ba7;">Del
            </apex:outputLink>
        </apex:column>
        <apex:column value="{!pat.Name}"/>
        <apex:column value="{!pat.Status__c}"/>
        <apex:column value="{!pat.Date__c}"/>
   </apex:pageBlockTable>
   <apex:outputLabel value="No records to display" rendered="{!(ISNULL(publicAccessTests))}" styleClass="noRowsHeader"></apex:outputLabel>
    <!-- Pagination -->
    <table style="width: 100%"><tr>
    
        <td>
            <!-- doesn't work -->
            <apex:outputText value="{!PageNumber} of {! CEILING(ResultSize / PageSize) }"/>
        </td>            
    
        <td align="center">   
        </td>
                
        <td align="right">
        </td>
    
    </tr></table> 
</apex:pageblock>

</apex:form>
</apex:page>

I've been doing every search I can think of to find the answer but at this point my brain is fried.
Thanks for any help