I can't ethically share test content. Look at the practice tests and think about basic mechanical principles. That's going to include things like levers, fulcrums, pulleys, gears, ramps, etc. That's not me giving you a list of test content, just a list of basic mechanical principles. Think about the stuff you learn in introductory physics: momentum, mass, pressure, temperature, flow. How do you use mechanical devices to make work easier? If you understand and can apply those basic concepts to real world situations, you're prepared.
As for tables, graphs, and the rest, don't get too hung up on specific content. Do you understand how to read a table? Do you understand how to calculate information from a table using the table's contents and math? If the axes are clearly labeled, can you read a graph and find specific information from it? If you can do those things, you're got the important skills you need.
I would say the quality of images on the practice tests is exactly equivalent to what you'll see on the real thing. They're not stunning 1080p resolution, but they're all legible.
I think each organization has some flexibility on breaks. We ran straight through the entire test, stopping only to read instructions between sections. You can stay focused on the test and not start worrying about upcoming sections because there isn't enough time to worry. If there's a medical reason you need breaks after a set amount of time, tell the company when they schedule you for the test.