org-agenda-skip-function not working

Question

Just recently, I made some changes to my org configuration as I had been making some changes in my daily work framework. That broke a part of my configuration.

(tags-todo "School"
                        ((org-agenda-skip-fuction '(org-agenda-skip-entry-if 'scheduled))
                         (org-agenda-overriding-header "School Work for today: ")))

Particularly, agenda entries which are scheduled are not being skipped. A typical such entry is as follows:

** TODO Make weekly test papers for next week, classes 9-12, for Maths, Sci etc.
   SCHEDULED: <2010-10-09 Sat +1w>

Earlier after a lot of effort, I had created a regular expression check which used to skip such entries. Of course, org-agenda-skip-entry-if 'scheduled is much better than that.

I know c#, but no lisp as such. Kindly help.