I want to theme this page node/add/classified. I tried creating page--node--add.tpl.php, page--classified--add.tpl.php, page--node--classified--add.tpl.php refreshing cache all the time...Nothing works
I tried also implementing hook_theme() and hook_preprocess_page().
If you want to create a tpl file for a particular content type as you mentioned in your post "node/add/classified", then I would suggest, you should go with the tpl name like this
Drupal 6 : page-node-add-[content type].tpl.php
Drupal 7 : page--node--add--[content type].tpl.php
in your case, this would be (assuming your Drupal version is 7.x):
page--node--add--classified.tpl.php
Hope it will help you.