Many people asked about the free shipping if the order exceeded over a certain amount its very simple just follow the steps.

1. If you have already configured the free shipping module from admin>>>modules>>>>shipping>>>>free shipping please disable that module to do that simply click on the free shipping and then click edit

enter the value 0 to disable it and then click update button

2. Now go to Modules>>>order total and click on shipping

then click edit

As you can see that you have plenty of options now click on true option to enable it , enter the amount from over you want to offer free shipping and you have choice either you want to offer free shipping for national or international orders or you can select the both option

Thats it !!!!!!

Enjoy