Hi!! I took the RHS exam last year. I used the DANB RHS practice test and DANB RHS Review found on the Dale Foundation website. You have to pay for these unfortunately but I will say that I thought it was really helpful in terms of helping me review all the material we learned in class. I also really liked it because it was user friendly and interactive. Some of the practice questions were also similar to the ones on my exam which was nice. If I remember correctly, I believe the subscriptions are good for 6 months but if you can, I recommend taking the exam soon after completing the course while everything is fresh in your mind.
I just checked their website and they added another resource called “Conventional Dental Radiography Review”. I don’t remember seeing this when I studied for the exam last year so I don’t know much about it. But that could be another resource for you if you have enough time to check it out.
There are also quite a few quizlets online for the RHS exam. To be honest, I didn’t look at these very much but I think they may be pretty helpful as well! I hope this helps and good luck on your exam!! Regardless of whatever resource you use, I’m sure you’ll do well on it 🙂