Are you metaphysiciansplurgist? 
Anyway. You’re conflating a lot of things here.
- Technicality. When you predict something, that’s called a hypothesis. When you offer a logical, falsifiable explanation for said hypothesis, we call that a theory.
- Reading comprises two dimensions; for the sake of argument, let’s call them distance and quality. Distance relates to how many moves you can accurately hallucinate in sequence. Quality relates to how good the moves are that you’re considering at each step.
- You can improve both by doing tsumego as well as memorizing and replaying games - if you like, you can replay them blindly.
- If you want to know to what degree your Distance improved, you will of course have to measure it (though by measuring it, you will inevitably produce practice effects). There are many possible ways to measure this, and you’d have to study which provides the cleanest or most reliable numbers, but one of the more practical setups would be to lay out problems whose solutions are trivial shapewise and entirely forced.
- If you want to know to what degree your Quality improved, you first have to realize that Quality is bounded by Distance. If you can only imagine a single stone, problems requiring you to find out why the “most natural” move fails - three steps down the road - will be intractable. Then you have to realize that you need at least two dimensions to describe the difficulty of a given tsumego - the number of moves N required to arrive at the shortest valid solution and the unintuitiveness U of each move in the sequence. Generally, unintuitive solutions are called tesuji. There is no practical setup to test Quality for reasons I won’t get into here, let’s just say it would be a very complex undertaking.
- The only practical reading test is to do n-move tsumego. The better your Distance, the more variations you can try. The better your Quality, the fewer variations you have to try.