If you have an android there are a bunch of free apps. I have used EMT Pocket Prep. Pocket Prep is good because they give you the answers and explaination along with the textbook page and chapter. There is one thats just called EMT Prep. And another free one called EMT Trainer.
For the paid ones...
Are you looking for just free resources? I can recommend some free and some pay sites that I have used to pass the emt. Also know there are a ton of YouTube videos that help as well.