A good place to start is your ROE as it has all your day-to-day tasks and has repetition. Go through ALL the questions in the Q&A for dental nurses. This will help you recognise any weak areas and should motivate you to learn the correct answer as well as understanding why you may have answered incorrectly.
Additionally, you could see if colleagues might be willing to help test you on the names of instruments and burs etc This could help with anatomy as well, as saying the answer out loud could help with learning.
You have time, so try not to panic. If you are starting revision now, there is no reason why you shouldn't pass.
All the best
X