When you study math what % of the material do you try to understand before moving on? I suppose there are big differences between mathematicians and physicists. I would imagine that if you're a mm then you would probably want to understand more than 95% before moving onto the next chapter. As for myself, I'm extremely impatient. I want to know jump from Classical Physics to Quantum Field Theory quick, consequently I skate by with just enough so that I'm not lost. I realize this is a fault but I'm just not patient enough. My plan is to get the basic gist of the material, then plug in the gaps of my understanding later. I get bored when I get bogged down in an intractable problem. It's so much easier for me to just drop the confusion and move on. So I probably understand about 80% of the material before I move to the next chapter.