As to my quantity-focused reading, I think as follows.

To choose appropriate reading materials is needed in reading exercise focused in quantity. As to this training, the materials for the main are more appropriate if they are:

- those which you are more or less interested in or you can willingly read

- those which are clear enough in logic

- those whose content is substantial enough (those which have a distinct content)

- those which you can read without (much) conceptual difficulty (those which discuss plainly enough and understandably enough)

Why these points? Those things are desirable so that you can see well the meaning of the text and in what context each sentence lies. With such clarity of understanding as to content, the semantical and syntactic aspects of sentences can be precisely and most efficiently absorbed.

In other words, in such kind of training, those texts or documents, or parts of them, which do not have all the points above are basically very okay to be skipped (or to do so is reasonable and appropriate).

This is the guideline I put for myself for now.