Here is a way of conceptualizing this problem that helped me:

The argument is essentially saying that given the volume and variety of preexisting artwork in the world, art consumers have reached a maximum value of potential artistic fulfillment. Thus all contemporary artists, who believe their art increases the artistic fulfillment of many people are mistaken because you can not increase artistic fulfillment beyond the maximum level already achieved.

Answer E attempts to exploit any misunderstanding of the concept of potential enjoyment because it offers a vulnerability indicating that the preexisting artwork impacts an individuals enjoyment of contemporary art. It attempts to form a correlation between these two variables which the argument does not support. Rather, the stimulus indicates that contemporary art can be enjoyed just as much as old art, but that it is simply unnecessary given that the threshold of maximum fulfillment has already been reached

Its all about reading through as quickly as possible, but not moving to the questions until you are sure that you understand all the different opinions involved and what they think and how they relate to one another. In other words, the big structure.

It is important to note that this does not mean skimming, or going too quickly. Often a tiny detail can alter a person's entire argument. And you need to be able to catch that or else you will definitely be missing more than one question on the passage or at least burning too much time and skipping a couple on the back end of the RC section.

As you practice more you will build intuition around what small details are important to memorize and connect to other information.

Other than that the biggest thing is pacing. Assuming you read through a passage quickly and efficiently, you should be spending 20 seconds per question tops! this means in essence read through the stem, options ABCDE, refer back to passage once if necessary then select answer. If you need to read through ABCDE again, too bad, mark the question and skip. Or else you will miss easy questions on the back end.