The summary must include the main points of the paragraph. It need not include illustrations of the point or elaborations of it but it MUST always include the main point
Do not get distracted by less important facts in the paragraph. The first thing you must search among the options is whether or not they address the main point of the paragraph
A summary should be crisp and to the point. Hence, eliminate options that give too much of irrelevant details
How to prepare for Summary questions:
The preparation for summary questions will be the same as for all reading comprehension type question - you need to learn to grasp the gist of the paragraph
To be able to cut to the main point of the paragraph, practice reading and summarizing paragraphs. While summarizing the paragraph try to identify what was the most important point or points of the paragraph. The whole passage would revolve around this point. If an example or illustration is given, it would be an illustration of this main point.
Read a lot newspapers, particularly editorials, and try to identify the main point of the editorial, the key arguments forwarded and the conclusion of the editorial