What workers are you low on? Those are the workers you need to prioritize. What workers do you have a surplus of? Those are the ones that you do not need to prioritize and can lower. For instance if you are done building a lot of hospitals, do you need to have you doctor and nurse priority to 12?
I keep an education index of at least 160. Many advanced players have indexes upwards of 200. I keep my total balance at 120-125 for education priorities.
I could just paste what I use exactly, and while that may improve your situation, context is important and you being able to identify stuff like that even more so.