I disabled that inbuilt minifier of the theme but still nothing is happening :/
The new css and js is generated...
http://www.kidspathshala.com/wp-content/cache/autoptimize/css/autoptimize_f5466968d0ea33e922d35dca2122bbfb.css
and
http://www.kidspathshala.com/wp-content/cache/autoptimize/js/autoptimize_aba2c8603bbf25091b5e2d0f6c32478a.js
but they are not used anywhere.