What's your study schedule currently look like? I might be interested!

How long have you been studying? Or how far apart were each of the PTs? Three sounds very early on in your studying and doesn't necessarily seem like stagnation, but more like very gradual progress. At this point my best piece of advice is be patient, be consistent and keep drilling. If you've just began studying, I would focus more on completing sections in their entirety untimed and really understanding the concepts before you get carried away with timing. Be patient with yourself, big score changes don't happen overnight!