Go to ground school
Greg737, I passed my PPL a few months ago and found the exams easy. But you and I are at the opposite ends of our careers. I had an electrical engineering degree to build on which included fluid mechanics and aerodynamics, have spend a great deal of my life racing small boats and am a yachtmaster offshore so knew sea level met and navigation etc. Everything I read slotted into place in a frame of reference I already had.
That would have been impossible for me at your age - there would simply have been too much new information on each page as I would not have had the experience to put it in context.
You will gain a great deal from the interaction with your instructor and other students and like the others here I would recommend you try to do ground school .