Consider the simpler sentence:
"Reading makes you smarter."
Add in the other words:
"Reading books every day makes you smarter." and you have the correct form
2012年6月6日
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Make is used with I,you,we, they and other plural subject.
Makes is used with he,she,it and other third person singular noun/pronouns.
2012年6月7日
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Makes. You can say about reading 'it makes you smarter' so makes is correct form.