Definitely an interesting topic. I recently got my EPA 608 type I certification online about 3ish months ago through Mainstream Engineering. The online one I did was broken down into 2 open book test sections: general information and type I information. Each section was 25 multiple choice questions. You needed to score an 85% in each section to pass. Their study guide was informative, but I would recommend you use a set of quizlet flash cards to study for the test.
Here's the catch with the online tests: You can only take them if you intend to get type I certified and that's it. To the best of my knowledge they don't have online tests for anything beyond type I.
Type I certification covers kitchen appliances and window AC's, pretty much everything with 5 pounds of freon in it or less. For me, type I is probably all I'll get since I'm looking to add window air conditioner recycling and other appliance recycling to my list of services offered.
If you intend to work on anything bigger you'll need to get type II and type III certified (also called universal certification). What I found out is that if you get type I certified online and down the road you want to get type II or type III certified you'll have to retake the tests in person through a proctored exam.
The other section I might be getting soon is the EPA 609 (for vehicle air conditioner systems). I've been putting it off since I started college again, but hopefully I'll get that one buckled down in the next few months.
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