I stuck with just UWORLD and Falcon and it did the job for me. I took about 4 weeks after the course and went through my books again while doing about 100-150 questions daily. One of the most important things you can do is expose yourself to as many questions as possible, so you can become familiar with all the different ways a question can be asked!
I did want to look at FirstAid but it didn't fit into my schedule at the time. Falcon did recently come out with a new module where you go through all of FirstAid in small 15-20 minute videos. I think this is a great new tool that would further solidify high yield points!! I added the link if you want to check it out!
http://www.falconreviews.com/firstaid/
Good luck!