Commentary
In the Holy Qur'an Surah Maryam has been placed immediately after Surah Al-Kahf, presumably because there appears some kind of similarity between the two Surahs. While the former deals with some unusual anecdotes, the latter also covers a number of extraordinary events.
كهيعص are letters known in Arabic as; حُرُوفِ مُقَطَّعَۃ whose meanings, like are known only to Allah Ta` ala and people should not even attempt to probe their meanings.