60 and up are different, though I don't know if they're harder as a whole. The LG game types are consistently easier, they just try and trip you up more with subtle modifier wording. LR is about the same to me, just that the second section usually has more avg word count per question(and more hard questions) and the first has less. I hate RC more now. There is more avg word count per answer choice so more reading, the passages are a bit trickier and arcane, and they like to make their hardest inference question correct answers less concretely supported by the passage(but the only one somewhat supported). I'd recommend you at least take a glance to see this and probably mix them into your PT schedule sooner.

I was just in the same boat a month ago. You need to habitualize the processes for handling each question type and the pace to get through them. Focus on drilling the types you miss on PTs and once you start getting accurate at them, time each question but don't worry about going over too much(I gave myself 1m 30s). This will help you judge your pace for each question and get more time efficient with your thinking. After that you want to transition to drilling timed sections if you have the material to. I've been doing it for just about a week. At first I was struggling to get through the sections, now I'm not worried. I know I can still go faster though, so I'm about to start shaving minutes off of my section times. Once you get to the stage of being able to blind review and determine your mistake and the right answer without much problem most of the time, you should have the understanding to start pushing your process. Someone mentioned this above but you need to have benchmark times. Mine are #10-10m, #15-15m, #20-25m. I know mine may be a little extreme, but I like to push the pace because I'm on autopilot from 1-14 for the most part(because the wrong answers are so much easier to eliminate) and I can catch myself when I'm stuck with a faulty answer or 2. Hope this helps!