Need to make async call in REST API sync

I have a code in jQuery as below:

$('.class').each(function(){
    //Ajax call to create list item using REST API

url: http://site url/_api/web/lists/GetByTitle(‘Test')/items
method: POST
body: { '__metadata': { 'type': 'SP.Data.TestListItem' }, 'Title': 'Test'}
headers:
    Authorization: "Bearer " + accessToken
     X-RequestDigest: form digest value
    accept: "application/json;odata=verbose"
    content-type: "application/json;odata=verbose"
    content-length:length of post body

})

I have PreSaveAction() where above code is placed, my page gets redirected even before all the items are created.

Not able to solve it.

Please help.