The activities in this e-book focus on listening comprehension, which is a precursor to reading comprehension. You can foster listening comprehension by discussing stories and characters, expanding vocabulary, and exposing children to a wide variety of activities. Sequencing activities--such as those found in this activity book--are also great for improving comprehension.
Not to mention that he actually likes and ENJOYS these books.

Go here to download a free sample.
Here’s the whole series… they also have some free downloads.